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in a sigma bond. Transition metal silane complexes are often especially stable sigma complexes. A particularly common subset of sigma complexes are those
Sigma_complex
Eighteenth letter of the Greek alphabet
Sigma (/ˈsɪɡmə/ SIG-mə; uppercase Σ, lowercase σ, lowercase in word-final position ς; Greek: σίγμα) is the eighteenth letter of the Greek alphabet. When
Sigma
Formation of a 3-center 2-electron bond between a transition metal and C–H bond
is a special case of a C–H sigma complex. Historically, agostic complexes were the first examples of C–H sigma complexes to be observed spectroscopically
Agostic_interaction
Forms during electrophilic substitution on benzene ring
this complex is also called a Wheland intermediate, after American chemist George Willard Wheland (1907–1976). They are also called sigma complexes. The
Arenium_ion
Method for converting signals between digital and analog
Delta-sigma (ΔΣ; or sigma-delta, ΣΔ) modulation is an oversampling method for encoding signals into low bit depth digital signals at a very high sample-frequency
Delta-sigma_modulation
Protein needed for initiation of transcription in prokaryotes
sigma factor with a molecular weight of 70 kDa. The sigma factor in the RNA polymerase holoenzyme complex is required for the initiation of transcription
Sigma_factor
Business process improvement technique
Six Sigma (6σ) is a set of techniques and tools for process improvement. It was introduced by American engineer Bill Smith while working at Motorola in
Six_Sigma
Matrices important in quantum mechanics and the study of spin
complex matrices that are traceless, Hermitian, involutory and unitary. They are usually denoted by the Greek letter σ {\displaystyle \sigma } (sigma)
Pauli_matrices
Non-tensorial representation of the spin group
{i} &=-\sigma _{2}\sigma _{3}=-i\sigma _{1}\\\mathbf {j} &=-\sigma _{3}\sigma _{1}=-i\sigma _{2}\\\mathbf {k} &=-\sigma _{1}\sigma _{2}=-i\sigma _{3}\end{aligned}}}
Spinor
silyl complexes describe coordination complexes in which a transition metal is bonded to an anionic silyl ligand, forming a metal-silicon sigma bond.
Transition metal silyl complexes
Transition_metal_silyl_complexes
Algebraic structure of set algebra
In mathematical analysis and in probability theory, a σ-algebra ("sigma algebra") is part of the formalism for defining sets that can be measured. In
Σ-algebra
Measure of covariance of components of a random vector
_{1})(X_{2}-\mu _{2})]}{\sigma (X_{1})\sigma (X_{2})}}&\cdots &{\frac {\operatorname {E} [(X_{1}-\mu _{1})(X_{n}-\mu _{n})]}{\sigma (X_{1})\sigma (X_{n})}}\\\\{\frac
Covariance_matrix
Covalent chemical bond
In chemistry, sigma bonds (σ bonds) or sigma overlap are the strongest type of covalent chemical bond. They are formed by head-on overlapping between atomic
Sigma_bond
Mathematics concept
field of complex numbers itself, considered as a complex vector space over itself and with the conjugation map σ : C → C {\displaystyle \sigma :{\mathbb
Real_structure
depending on the complex), a medium adaptin (mu), and a small adaptin (sigma): complex 1 AP1B1 AP1G1 AP1G2 AP1M1 AP1M2 AP1S1 AP1S2 AP1S3 complex 2 AP2A1 AP2A2
List_of_adaptins
Matrix decomposition
{U} \mathbf {\Sigma } \mathbf {V} ^{*}} , where U {\displaystyle \mathbf {U} } is an m × m {\displaystyle m\times m} complex unitary matrix
Singular_value_decomposition
Characteristic property of holomorphic functions
f=(\sigma _{1}\partial _{x}+\sigma _{2}\partial _{y})(u+\sigma _{1}\sigma _{2}v)\\[4pt]&=\sigma _{1}\partial _{x}u+\underbrace {\sigma _{1}\sigma _{1}\sigma
Cauchy–Riemann_equations
Containing intact H2 as a ligand
Dihydrogen complexes are coordination complexes containing intact H2 as a ligand. They are a subset of sigma complexes. The prototypical complex is W(CO)3(PCy3)2(H2)
Dihydrogen_complex
Probability distribution
{\textstyle \sigma ^{2}} is the variance. The standard deviation of the distribution is the positive value σ {\displaystyle \sigma } (sigma). A random
Normal_distribution
Four-dimensional number system
2 complex matrix above can be written as a I + b i σ 3 + c i σ 2 + d i σ 1 , {\displaystyle a\,I+b\,i\,\sigma _{3}+c\,i\,\sigma _{2}+d\,i\,\sigma _{1}
Quaternion
Sigma non-innocence is a special form of non-innocence, an oxidation characteristic in metal complexes. It is mainly discussed in coordination complexes
Sigma_non-innocence
Addition of Si-H bonds across unsaturated bonds
complex that contains a hydride, a silyl ligand (R3Si), and the alkene substrate. Oxidative addition proceeds by the intermediacy of a sigma-complex,
Hydrosilylation
Probability distribution
, {\displaystyle f(x;\sigma )={\frac {x}{\sigma ^{2}}}e^{-x^{2}/(2\sigma ^{2})},\quad x\geq 0,} where σ {\displaystyle \sigma } is the scale parameter
Rayleigh_distribution
Type of reaction in organometallic chemistry
three-centered σ complex is invoked, followed by intramolecular ligand bond cleavage of the ligand (probably by donation of electron pair into the sigma* orbital
Oxidative_addition
Complex in algebraic topology
}(X)} . Then, for each σ ⊂ X {\displaystyle \sigma \subset X} , let σ ∈ C ˇ ε ( X ) {\displaystyle \sigma \in {\check {C}}_{\varepsilon }(X)} if the set
Čech_complex
vertices. An abstract simplicial complex Δ is a set of finite sets of vertices, known as faces σ ⊆ V {\displaystyle \sigma \subseteq V} , such that ∀ ρ ∀
Poset_topology
\operatorname {Lk} (\sigma ,X):=\{\tau \in X:~\tau \cap \sigma =\emptyset ,~\tau \cup \sigma \in X\}} . Given a geometric simplicial complex X and any face
Link_(simplicial_complex)
chemistry, sigma-bond metathesis is a chemical reaction wherein a metal-ligand sigma bond undergoes metathesis (exchange of parts) with the sigma bond in
Sigma-bond_metathesis
Type of mathematical set
{\displaystyle \sigma \in {\mathcal {K}}} of dimension exactly k. Informally, a pure 1-complex "looks" like it's made of a bunch of lines, a 2-complex "looks"
Simplicial_complex
Algebraic structure associated with a topological space
{\displaystyle \sigma [0]<\sigma [1]<\cdots <\sigma [n]} in the complex's vertex ordering, where σ [ i ] {\displaystyle \sigma [i]} is the i {\displaystyle
Homology_(mathematics)
Business management method
Design for Six Sigma (DFSS) is a collection of best-practices for the development of new products and processes. It is sometimes deployed as an engineering
Design_for_Six_Sigma
Concept in algebraic topology
− P ( ∂ σ ) . {\displaystyle \partial P(\sigma )=f_{\sharp }(\sigma )-g_{\sharp }(\sigma )-P(\partial \sigma ).} So if α in Cn(X) is an n-cycle, then
Singular_homology
Problem in applied mathematics
}={\frac {\int D\sigma A[\sigma ]\exp(i\theta [\sigma ])\,p[\sigma ]}{\int D\sigma \exp(i\theta [\sigma ])\,p[\sigma ]}}={\frac {\langle A[\sigma ]\exp(i\theta
Numerical_sign_problem
Neighbour-dependent grapheme positioning
to simply equate the two sigma codes for operations which are concerned with word content, for example. Examples of complex rendering — SIL international's
Complex_text_layout
Measure with complex values
is a complex number. Formally, a complex measure μ {\displaystyle \mu } on a measurable space ( X , Σ ) {\displaystyle (X,\Sigma )} is a complex-valued
Complex_measure
Math concept
{\displaystyle \sigma _{1},\sigma _{2}\in {\mathcal {K}}} is a face of both σ 1 {\displaystyle \sigma _{1}} and σ 2 {\displaystyle \sigma _{2}} . Note that
Polyhedral_complex
Failure Theory in continuum mechanics
strength, σ y {\displaystyle \sigma _{\text{y}}} . The von Mises stress is used to predict yielding of materials under complex loading from the results of
Von_Mises_yield_criterion
Relativistic wave description of fermions
{\displaystyle \sigma ^{\mu }={\begin{pmatrix}\sigma ^{0}&\sigma ^{1}&\sigma ^{2}&\sigma ^{3}\end{pmatrix}}={\begin{pmatrix}I_{2}&\sigma _{x}&\sigma _{y}&\sigma _{z}\end{pmatrix}}}
Majorana_equation
Chemical reaction in organic chemistry
coordination of the C–H bond with the metal to form a metal–hydrocarbon sigma complex. The computed transition state involves concerted partial formation
Concerted metalation deprotonation
Concerted_metalation_deprotonation
Elementary particles with a spin of 1/2
\right|{\boldsymbol {\sigma }}\left|\psi \right\rangle } , where σ = ( σ x , σ y , σ z ) {\displaystyle {\boldsymbol {\sigma }}=(\sigma _{x},\sigma _{y},\sigma _{z})}
Spin_1/2
Combinatorial approach of studying the topology of a manifold
{\displaystyle \sigma } , provided that X {\displaystyle {\mathcal {X}}} is a regular CW complex. In this case, each cell σ ∈ X {\displaystyle \sigma \in {\mathcal
Discrete_Morse_theory
K {\displaystyle K} be an abstract simplicial complex. Suppose that τ , σ {\displaystyle \tau ,\sigma } are two simplices of K {\displaystyle K} such
Collapse_(topology)
Function that is holomorphic on the whole complex plane
In complex analysis, an entire function, also called an integral function, is a complex-valued function that is holomorphic on the whole complex plane
Entire_function
American materials scientist
advancement of the Los Alamos Neutron Science Center (LANSCE) and the Sigma Complex. In 2024 and 2025, Cerreta led teams conducting forefront research in
Ellen_Cerreta
Linear filter used for texture analysis
gabor_fn(sigma, theta, lambda, psi, gamma) sigma_x = sigma; sigma_y = sigma / gamma; % Bounding box nstds = 3; xmax = max(abs(nstds * sigma_x * cos(theta))
Gabor_filter
Number, approximately 2.41421
{\begin{aligned}\sigma ^{n}&=2\sigma ^{n-1}+\sigma ^{n-2}\\&=\sigma ^{n-1}+3\sigma ^{n-2}+\sigma ^{n-3}\\&=2\sigma ^{n-1}+2\sigma ^{n-3}+\sigma ^{n-4}\end{aligned}}}
Silver_ratio
Equation relating to oscillating systems
{\displaystyle \sigma =\sigma _{r}+i\sigma _{i}} is the complex growth rate, l = l r + i l i {\displaystyle l=l_{r}+il_{i}} is a complex number and l r
Stuart–Landau_equation
Gaussian-windowed wavelet
) {\displaystyle \Psi _{\sigma }(t)=c_{\sigma }\pi ^{-{\frac {1}{4}}}e^{-{\frac {1}{2}}t^{2}}(e^{i\sigma t}-\kappa _{\sigma })} where κ σ = e − 1 2 σ
Morlet_wavelet
Integral transform useful in probability theory, physics, and engineering
(Eq. 1) where s {\displaystyle s} is a complex frequency-domain parameter s = σ + i ω {\textstyle s=\sigma +i\omega } with real numbers σ and ω. An
Laplace_transform
Set of eigenvalues of a matrix
{\displaystyle \sigma (T)\cap \mathbb {R} =\sigma _{\mathbb {R} }(T)} . Note that the real spectrum may or may not coincide with the complex spectrum. In
Spectrum (functional analysis)
Spectrum_(functional_analysis)
Species of snake
Boa sigma, known commonly as the Mexican west coast boa constrictor or Bateman’s Boa, is a species of snake in the family Boidae. The species is endemic
Boa_sigma
Foundational principle in quantum physics
that year and by Hermann Weyl in 1928: σ x σ p ≥ ℏ 2 {\displaystyle \sigma _{x}\sigma _{p}\geq {\frac {\hbar }{2}}} where ℏ = h 2 π {\displaystyle \hbar
Uncertainty_principle
Measure of a substance's ability to resist or conduct electric current
sigma _{xx}&\sigma _{xy}&\sigma _{xz}\\\sigma _{yx}&\sigma _{yy}&\sigma _{yz}\\\sigma _{zx}&\sigma _{zy}&\sigma
Electrical resistivity and conductivity
Electrical_resistivity_and_conductivity
Fundamental operation on complex numbers
In mathematics, the complex conjugate of a complex number is the number with an equal real part and an imaginary part equal in magnitude but opposite in
Complex_conjugate
Mathematical object
of CW complexes together with inclusions Σ E n → E n + 1 {\displaystyle \Sigma E_{n}\to E_{n+1}} of the suspension Σ E n {\displaystyle \Sigma E_{n}}
Spectrum_(topology)
Result about when a matrix can be diagonalized
m × n {\displaystyle \Sigma \in \mathbb {R} ^{m\times n}} is a diagonal matrix. The diagonal entries of Σ {\displaystyle \Sigma } are uniquely determined
Spectral_theorem
Mode of convergence of an infinite series
\sigma \left(I_{\sigma ,\varepsilon }\right)=\min \left\{\sigma (k)\ :\ k\in I_{\sigma ,\varepsilon }\right\}\\L_{\sigma ,\varepsilon }&=\max \sigma \left(I_{\sigma
Absolute_convergence
Particular kind of algebraic structure
{\displaystyle x\in A,} denoted by σ ( x ) {\displaystyle \sigma (x)} , consists of all those complex scalars λ {\displaystyle \lambda } such that x − λ 1 {\displaystyle
Banach_algebra
Linear transformation of spacetime coordinates
{\displaystyle q^{*}=a-b\,\mathbf {\sigma } _{x}-c\,\mathbf {\sigma } _{y}-d\,\mathbf {\sigma } _{z}} The analog of the complex conjugate is q ¯ = a ¯ − b ¯
Biquaternion Lorentz transformation
Biquaternion_Lorentz_transformation
Mathematical transform that expresses a function of time as a function of frequency
Still with ξ = σ + i τ {\displaystyle \xi =\sigma +i\tau } , if f ^ {\displaystyle {\widehat {f}}} is complex analytic for a ≤ τ ≤ b and has sufficient
Fourier_transform
Name of the protein necessary for prokaryotic regulation
necessary for the prokaryotic regulation transcription factor sigma N (sigma 54) to form an open complex with RNA polymerase in order to activate glnA transcription
NtrC
Interstellar cloud
Sh2-9 has Sigma Scorpii at its center, and Antares is just outside the picture at the bottom. The large multicoloured Rho Ophiuchi cloud complex with the
Rho_Ophiuchi_cloud_complex
U.S. project to build a nuclear thermal rocket
Pajarito Site. Fuel and internal engine components were fabricated in the Sigma complex at Los Alamos. Testing of fuel elements and other materials science
Project_Rover
Probability distribution
{\ln x-\mu }{\sigma }}\right)}{\frac {1}{\sigma x}}\\[6pt]&={\frac {1}{x\sigma {\sqrt {2\pi }}}}\exp \left(-{\frac {(\ln x-\mu )^{2}}{2\sigma ^{2}}}\right)~
Log-normal_distribution
^{*}E_{0}{\stackrel {\sigma (P_{1})}{\longrightarrow }}\pi ^{*}E_{1}{\stackrel {\sigma (P_{2})}{\longrightarrow }}\ldots {\stackrel {\sigma (P_{k})}{\longrightarrow
Elliptic_complex
Intermolecular forces between oppositely-charged sites on molecules
In chemistry, sigma hole interactions (or σ-hole interactions) are a family of intermolecular forces that can occur between several classes of molecules
Sigma_hole_interactions
Distribution of singular values of large rectangular random matrices
s(z)={\frac {\sigma ^{2}(1-\lambda )-z-{\sqrt {(z-\sigma ^{2}(\lambda +1))^{2}-4\lambda \sigma ^{4}}}}{2\lambda z\sigma ^{2}}}} for complex numbers z of
Marchenko–Pastur_distribution
Generalization of the one-dimensional normal distribution to higher dimensions
_{Y}\end{pmatrix}},\quad {\boldsymbol {\Sigma }}={\begin{pmatrix}\sigma _{X}^{2}&\rho \sigma _{X}\sigma _{Y}\\\rho \sigma _{X}\sigma _{Y}&\sigma _{Y}^{2}\end{pmatrix}}
Multivariate normal distribution
Multivariate_normal_distribution
Links the homology groups of a product space with those of the individual spaces
C_{*}(Y)}(\sigma \otimes \tau )=\partial _{X}\sigma \otimes \tau +(-1)^{p}\sigma \otimes \partial _{Y}\tau } for σ ∈ C p ( X ) {\displaystyle \sigma \in C_{p}(X)}
Eilenberg–Zilber_theorem
Chemical compounds
hydrogenations. Hydrosilanes form sigma complexes with unsaturated metals. The bonding is similar to that in dihydrogen complexes but stronger. One example is
Hydrosilanes
Mathematical problems related to differential equations
{\displaystyle \Sigma } is a smooth, simple, closed contour in the complex plane. Divide the plane into two parts denoted by Σ + {\displaystyle \Sigma _{+}} (the
Riemann–Hilbert_problem
Method in algebraic topology
) σ | [ v q , … , v p ] . {\displaystyle \sigma \frown \psi =\psi (\sigma |_{[v_{0},\ldots ,v_{q}]})\sigma |_{[v_{q},\ldots ,v_{p}]}.} Here, the notation
Cap_product
Class of protein transcription factors
transcription initiation requires an RNA polymerase and a single GTF: sigma factor. In archaea and eukaryotes, transcription initiation requires an
General_transcription_factor
Mathematical functions related to Weierstrass's elliptic function
of a complex variable that are auxiliary to the Weierstrass elliptic function. They are named for Karl Weierstrass. The relation between the sigma, zeta
Weierstrass_functions
n_{1}\sigma _{1}+\cdots +n_{k}\sigma _{k}\in C_{0}} , then ε ( n 1 σ 1 + ⋯ + n k σ k ) = n 1 + ⋯ + n k ∈ Z {\displaystyle \varepsilon (n_{1}\sigma _{1}+\cdots
Poincaré_complex
Relativistic wave equation describing massless fermions
{\displaystyle \sigma ^{\mu }={\begin{pmatrix}\sigma ^{0}&\sigma ^{1}&\sigma ^{2}&\sigma ^{3}\end{pmatrix}}={\begin{pmatrix}I_{2}&\sigma _{x}&\sigma _{y}&\sigma _{z}\end{pmatrix}}}
Weyl_equation
Generalization of complex inner products
mathematics, a sesquilinear form is a generalization of inner products of complex vector spaces, which are the most common sesquilinear forms. A bilinear
Sesquilinear_form
Statistical measure of variability
{MAD} =\sigma {\sqrt {2}}\operatorname {erf} ^{-1}(1/2)\approx 0.67449\sigma .} This form is used in, e.g., the probable error. In the case of complex values
Median_absolute_deviation
Effect of variables' uncertainties on the uncertainty of a function based on them
_{1}^{2}&\sigma _{12}&\sigma _{13}&\cdots \\\sigma _{21}&\sigma _{2}^{2}&\sigma _{23}&\cdots \\\sigma _{31}&\sigma _{32}&\sigma _{3}^{2}&\cdots
Propagation_of_uncertainty
Protein-coding gene in the species Homo sapiens
AP-3 complex subunit sigma-1 is a protein that in humans is encoded by the AP3S1 gene. GRCh38: Ensembl release 89: ENSG00000177879 – Ensembl, May 2017
AP3S1
Pipe stress analysis software
analysis from SIGMA Ingenieurgesellschaft mbH, based in Unna, Germany. The software performs both static and dynamic analysis of complex piping and skeletal
ROHR2
Chaperone protein
The sigma-1 receptor (σ1R), one of two sigma receptor subtypes, is a chaperone protein at the endoplasmic reticulum (ER) that modulates calcium signaling
Sigma-1_receptor
Data-driven improvement cycle used for improving and optimizing business processes
improvement cycle is the core tool used to drive Six Sigma projects. However, DMAIC is not exclusive to Six Sigma and can be used as the framework for other improvement
DMAIC
Kind of mathematical function
{\displaystyle \sigma } -algebra of Lebesgue measurable sets, and B C {\displaystyle {\mathcal {B}}_{\mathbb {C} }} is the Borel algebra on the complex numbers
Measurable_function
Measure of the joint variability
sigma ^{2}(X)-{\frac {(\operatorname {cov} (X,Y))^{2}}{\sigma ^{2}(Y)}}\\\implies (\operatorname {cov} (X,Y))^{2}&\leq \sigma ^{2}(X)\sigma
Covariance
Method to estimate the components of a signal
( ω i t + ϕ i ) {\displaystyle {\hat {f}}(t)=\sum _{i=1}^{N}A_{i}e^{\sigma _{i}t}\cos(\omega _{i}t+\phi _{i})} to the observed f ( t ) {\displaystyle
Prony's_method
Antagonists of a youth's slang
a sigma factor, an anti-sigma factor, an anti-anti-sigma factor, and an input phosphatase complex. A cell that is not under stress has an anti-sigma factor
Anti-sigma_factors
Generators of the Clifford algebra for relativistic quantum mechanics
}={\begin{pmatrix}0&\sigma ^{\mu }\\{\overline {\sigma }}^{\mu }&0\end{pmatrix}},\quad \sigma ^{\mu }\equiv (1,\sigma ^{i}),\quad {\overline {\sigma }}^{\mu }\equiv
Gamma_matrices
Result due to Kummer on cyclic extensions of fields that leads to Kummer theory
\sigma (a)\,\sigma ^{2}(a)\cdots \sigma ^{n-1}(a)=1,} then there exists b {\displaystyle b} in L such that a = b / σ ( b ) . {\displaystyle a=b/\sigma
Hilbert's_Theorem_90
Infinite series in mathematical analysis
converges everywhere on the complex plane. The abscissa of convergence of a Dirichlet series can be defined as σ c {\displaystyle \sigma _{c}} above. Another
General_Dirichlet_series
Statistical measure of how far values spread from their average
variable with itself, and it is often represented by σ 2 {\displaystyle \sigma ^{2}} , s 2 {\displaystyle s^{2}} , Var ( X ) {\displaystyle \operatorname
Variance
notable alumni and honorary members of Alpha Chi Sigma professional chemistry fraternity. Carolyn Bertozzi, Sigma 2001 (2022), "for the development of click
List of Alpha Chi Sigma members
List_of_Alpha_Chi_Sigma_members
Class of computational fluid dynamics methods
_{\sigma }{\frac {\rho ^{\sigma }{\vec {u^{\sigma }}}}{\tau _{f}^{\sigma }}}\right)/\left(\sum _{\sigma }{\frac {\rho ^{\sigma }}{\tau _{f}^{\sigma }}}\right)}
Lattice_Boltzmann_methods
Simple quantum mechanical system
{d\sigma _{j}}{dt}}=\left[\sigma _{j},H\right]=\left[\sigma _{j},-\mu \sigma _{i}B_{i}\right]=-\mu \left(\sigma _{j}\sigma _{i}B_{i}-\sigma _{i}\sigma
Two-state_quantum_system
Technique used to study & characterize materials
following equations hold: Stress: σ = σ 0 sin ( t ω + δ ) {\displaystyle \sigma =\sigma _{0}\sin(t\omega +\delta )\,} Strain: ε = ε 0 sin ( t ω ) {\displaystyle
Dynamic_mechanical_analysis
Covariance and correlation
)}{\sigma _{X}\sigma _{Y}}}={\frac {\operatorname {E} \left[{\overline {\left(X_{t}-\mu _{X}\right)}}\left(Y_{t+\tau }-\mu _{Y}\right)\right]}{\sigma _{X}\sigma
Cross-correlation
Indian automotive manufacturer company
Premier Sigma (a compact diesel MPV) Premier Sigma Lifeline (an ambulance based on Sigma Platform) Premier Sigma Express (a cargo carrier based on Sigma Platform)
Premier_Automobiles_Limited
Generalization of mass, length, area and volume
pair ( X , Σ ) {\displaystyle (X,\Sigma )} is called a measurable space, and the members of Σ {\displaystyle \Sigma } are called measurable sets. A triple
Measure_(mathematics)
Technique for the generative modeling of a continuous probability distribution
{\displaystyle \sigma _{t}:={\sqrt {1-{\bar {\alpha }}_{t}}}} σ ~ t := σ t − 1 σ t β t {\displaystyle {\tilde {\sigma }}_{t}:={\frac {\sigma _{t-1}}{\sigma _{t}}}{\sqrt
Diffusion_model
Type of linear operator on a Banach sapce
{\displaystyle \Sigma _{\omega }:=\{z\in \mathbb {C} \setminus \{0\}:|\operatorname {arg} z|<\omega \}} , and set Σ 0 := ( 0 , ∞ ) {\displaystyle \Sigma _{0}:=(0
Sectorial_operator
SIGMA COMPLEX
SIGMA COMPLEX
Surname or Lastname
English
English : patronymic from a short form of the personal name Simon.Jewish (from Ukraine; Symes, Symis) : metronymic from the Yiddish female personal name Sime (see Sima).Benjamin Syms was a planter and philanthropist, probably the earliest inhabitant of any North American colony to bequeath property for the establishment of a free school. His name was spelled variously as Sims, Simes, Sym, Symms, Syms, and Symes. He was probably born in England, but was reported in the VA census of 1624/25 as age 33 and living at Basse’s Choice in what was later known as Isle of Wight County.
Surname or Lastname
English (Midlands)
English (Midlands) : from the Middle English personal name, a pet form of Sim.Jewish (from Belarus) : metronymic from Simke, a pet form of the Yiddish female personal name Sime (see Sima) with the eastern Slavic possessive suffix -in.
Girl/Female
Arabic, Muslim
Peace
Surname or Lastname
English
English : nickname for a person with a ruddy complexion, from an adjective derivative of Middle English mad(d)er ‘madder’, the dye plant (see Mader 1), here used in a transferred sense.
Female
Hindi/Indian
(सीमा) Hindi name SIMA means "boundary, limit." Compare with another form of Sima.
Girl/Female
Tamil
Boundary, Border
Girl/Female
Scottish
Listener.
Male
Hebrew
(ש×Öµ×) Hebrew name SHEM means "conspicuous position, name, renown, sigma." In the bible, this is the name of a son of Noah.
Surname or Lastname
English
English : from the popular medieval personal name Hudde, which is of complex origin. It is usually explained as a pet form of Hugh, but there was a pre-existing Old English personal name, Hūda, underlying place names such as Huddington, Worcestershire. This personal name may well still have been in use at the time of the Norman Conquest. If so, it was absorbed by the Norman Hugh and its many diminutives. Reaney adduces evidence that Hudde was also regarded as a pet form of Richard.German : from a short form of a Germanic compound personal name formed with hut ‘guard’ as the first element.Variant spelling of German Hütt (see Huett).Jewish (Ashkenazic) : metonymic occupational name from Yiddish hut, German Hut ‘hat’ (see Huth).
Surname or Lastname
English
English : patronymic from Sim.Jewish (Ashkenazic) : metronymic from the Yiddish female personal name Sime (see Sima).
Boy/Male
Norse
Victorious defender.
Surname or Lastname
English
English : nickname for someone with a complexion that was as ‘white as a lily’ (Middle English lilie).
Girl/Female
Latin
Sign.
Girl/Female
British, Danish, English, German, Swedish
Powerful Silence; Peaceful Victory
Girl/Female
Hindu
Boundary, Border
Girl/Female
Afghan, Arabic, Armenian, Australian, Farsi, French, Gujarati, Hebrew, Hindu, Indian, Malayalam, Muslim, Sanskrit, Tamil
Limit; Border; Listener; Precious Thing; Treasure; Boundary; Bank; Shore
Female
Hindi/Indian
(सीमा) Variant spelling of Hindi Sima, SEEMA means "boundary, limit." Compare with another form of Seema.
Boy/Male
Arabic, Muslim
Gold Stigma of a Flower; Derived from Zarparan
Boy/Male
Hindu, Indian, Muslim
Powerful; Mighty; Strong; Rich; Successful
Girl/Female
Danish, German, Latin, Scandinavian, Swedish
Sign; Signal; Victory
SIGMA COMPLEX
SIGMA COMPLEX
Boy/Male
Tamil
Lord of gods
Girl/Female
American, Australian, Chinese
Hunter; One who Hunts
Boy/Male
Hindu
Noble
Boy/Male
Arabic, Parsi
Mind and Intellect; Devil; Evil Spirit
Girl/Female
Tamil
Asvika | அஸà¯à®µà®¿à®•à®¾
A little mare
Boy/Male
Tamil
Loving, God gifted
Boy/Male
Muslim
Brave
Girl/Female
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Sindhi, Tamil, Telugu
A Lotus; Type of Flower which Lord Krishna Likes
Girl/Female
Latin
Beautiful, loving, lovable.Amabel was used frequently during the Middle Ages and briefly in the...
Boy/Male
Muslim
Sword of dream
SIGMA COMPLEX
SIGMA COMPLEX
SIGMA COMPLEX
SIGMA COMPLEX
SIGMA COMPLEX
pl.
of Stigma
v. t.
Marks believed to have been supernaturally impressed upon the bodies of certain persons in imitation of the wounds on the crucified body of Christ. See def. 5, above.
n.
A stigma. See Stigma, n., 6 (a) & (b).
v. t.
One of the external openings of the tracheae of insects, myriapods, and other arthropods; a spiracle.
v. t.
A small spot, mark, scar, or a minute hole; -- applied especially to a spot on the outer surface of a Graafian follicle, and to spots of intercellular substance in scaly epithelium, or to minute holes in such spots.
v. t.
A red speck upon the skin, produced either by the extravasation of blood, as in the bloody sweat characteristic of certain varieties of religious ecstasy, or by capillary congestion, as in the case of drunkards.
v. t.
To apply pollen to (a stigma).
a.
Of or pertaining to a stigma or stigmata.
v. t.
One of the apertures of the gill of an ascidian, and of Amphioxus.
n.
pl. of Stigma.
v. t.
A point so connected by any law whatever with another point, called an index, that as the index moves in any manner in a plane the first point or stigma moves in a determinate way in the same plane.
v. t.
A mark made with a burning iron; a brand.
pl.
of Sigma
v. t.
Any mark of infamy or disgrace; sign of moral blemish; stain or reproach caused by dishonorable conduct; reproachful characterization.
pl.
of Stigma
v. t.
One of the apertures of the pulmonary sacs of arachnids. See Illust. of Scorpion.
v. t.
That part of a pistil which has no epidermis, and is fitted to receive the pollen. It is usually the terminal portion, and is commonly somewhat glutinous or viscid. See Illust. of Stamen and of Flower.
n.
Stigma; brand; reproach.
n. pl.
The signs, abbreviations, letters, or characters standing for words, shorthand, etc., in ancient manuscripts, or on coins, medals, etc.
n.
The Greek letter /, /, or / (English S, or s). It originally had the form of the English C.