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Number with a real and an imaginary part
In mathematics, a complex number is an element of a number system that extends the real numbers with a specific element denoted i, called the imaginary
Complex_number
Distance from zero to a number
corresponding point in the complex plane from the origin. This can be computed using the Pythagorean theorem: for any complex number z = x + i y , {\displaystyle
Absolute_value
Reals with an extra square root of +1 adjoined
In algebra, a split-complex number (or hyperbolic number, also perplex number, double number) is based on a hyperbolic unit j satisfying j 2 = 1 {\displaystyle
Split-complex_number
Angle of complex number about real axis
In mathematics (particularly in complex analysis), the argument of a complex number z, denoted arg(z), is the angle between the positive real axis and
Argument_(complex_analysis)
Model of the extended complex plane plus a point at infinity
Bernhard Riemann, is a model of the extended complex plane (also called the closed complex plane): the complex plane plus one point at infinity. This extended
Riemann_sphere
Used to count, measure, and label
preceding one. So, for example, a rational number is also a real number, and every real number is also a complex number. This chain of set inclusions can be
Number
Logarithm of a complex number
are strongly related: A complex logarithm of a nonzero complex number z {\displaystyle z} , defined to be any complex number w {\displaystyle w} for which
Complex_logarithm
Geometric representation of the complex numbers
complex number of modulus 1 acts as a rotation (the circle group). The complex plane is sometimes called the Argand plane or Gauss plane. In complex analysis
Complex_plane
Opposition of a circuit to a current when a voltage is applied
resistance, which has only magnitude. Impedance can be represented as a complex number, with the same units as resistance, for which the SI unit is the ohm
Electrical_impedance
Complex exponential in terms of sine and cosine
respectively. This complex exponential function is sometimes denoted cis x ("cosine plus i sine"). The formula is still valid if x is a complex number, and is also
Euler's_formula
Extension of the factorial function
{\displaystyle \Gamma (z)} is due to Legendre. If the real part of the complex number z {\displaystyle z} is strictly positive ( ℜ ( z ) > 0 {\displaystyle
Gamma_function
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
Complex_conjugate
Type of complex number
the equation x 2 − x − 1 = 0 {\displaystyle x^{2}-x-1=0} , and the complex number 1 + i {\displaystyle 1+i} is algebraic because it is a root of the polynomial
Algebraic_number
Square root of a non-positive real number
Gauss in the early 19th century. An imaginary number bi can be added to a real number a to form a complex number of the form a + bi, where the real numbers
Imaginary_number
Number whose square is a given number
called the complex numbers, that does contain solutions to the square root of a negative number. This is done by introducing a new number, denoted by
Square_root
Arithmetic operation
base b {\displaystyle b} and any real number exponent x {\displaystyle x} . More involved definitions allow complex base and exponent, as well as certain
Exponentiation
In mathematics, a non-algebraic number
In mathematics, a transcendental number is a real or complex number that is not algebraic: that is, not the root of a non-zero polynomial with integer
Transcendental_number
Branch of mathematics studying functions of a complex variable
of a complex variable of complex numbers. It is helpful in many branches of mathematics, including functional analysis, algebraic geometry, number theory
Complex_analysis
Principal square root of minus 1
number system known as the complex numbers is formed; it consists of all numbers of the form a + bi with real numbers a and b. There are two complex square
Imaginary_unit
Four-dimensional algebra over the real numbers
form of either: The dual numbers, but with complex-number entries The complex numbers, but with dual-number entries An algebra meeting either description
Applications of dual quaternions to 2D geometry
Applications_of_dual_quaternions_to_2D_geometry
American inventor of the digital computer
in late 1938 with Stibitz at the helm. He led the development of the Complex Number Calculator (CNC), completed in November 1939 and put into operation
George_Stibitz
Complex number representing a particular sine wave
physics and engineering, a phasor (a portmanteau of phase vector) is a complex number representing a sinusoidal function whose amplitude A and initial phase
Phasor
Mathematical relation making a non-equal comparison
mathematical expressions. It is used most often to compare two numbers on the number line by their size. The main types of inequality are less than and greater
Inequality_(mathematics)
Branch of pure mathematics
number theory, by contrast, relies on complex numbers and techniques from analysis and calculus. Algebraic number theory employs algebraic structures such
Number_theory
programming languages provide a complex data type for complex number storage and arithmetic as a built-in (primitive) data type. A complex variable or value is usually
Complex_data_type
Topics referred to by the same term
complex, a coordination complex with more than one bond Complex number, an extension of real numbers obtained by adjoining imaginary numbers Complex,
Complex
Arctangent function with two arguments
phase or angle) of the complex number x + i y . {\displaystyle x+iy.} (The argument of a function and the argument of a complex number, each mentioned above
Atan2
Real numbers adjoined with a nil-squaring element
Perturbation theory Infinitesimal Screw theory Dual-complex number Laguerre transformations Grassmann number Automatic differentiation Alexander J. Hahn (1994)
Dual_number
Number property of being positive or negative
described in § Other meanings below. Numbers from various number systems, like integers, rationals, complex numbers, quaternions, octonions, ... may have multiple
Sign_(mathematics)
Integer
real number square roots of −1, the complex number i satisfies i2 = −1, and as such can be considered as a square root of −1. The only other complex number
−1
Number with an integer power equal to 1
In mathematics, a root of unity is any complex number that yields 1 when raised to some positive integer power n. Roots of unity are used in many branches
Root_of_unity
Complex number whose real and imaginary parts are both integers
In number theory, a Gaussian integer is a complex number whose real and imaginary parts are both integers. The Gaussian integers, with ordinary addition
Gaussian_integer
Arithmetic operation, inverse of nth power
unit. In general, any non-zero complex number has n distinct complex-valued nth roots, equally distributed around a complex circle of constant absolute value
Nth_root
Number whose cube is a given number
integer or of a rational number is generally not a rational number, nor a constructible number. Every nonzero real or complex number has exactly three cube
Cube_root
Mathematical function, inverse of an exponential function
−1. Such a number can be visualized by a point in the complex plane, as shown at the right. The polar form encodes a non-zero complex number z by its absolute
Logarithm
Property of a mathematical space
sometimes useful in the study of complex manifolds and algebraic varieties to work over the complex numbers instead. A complex number ( x + i y {\displaystyle
Dimension
Method of drawing geometric objects
A complex number that can be expressed using only the field operations and square roots (as described above) has a planar construction. A complex number
Straightedge and compass construction
Straightedge_and_compass_construction
Fundamental trigonometric functions
can be extended further via complex number, a set of numbers composed of both real and imaginary numbers. For real number θ {\displaystyle \theta } ,
Sine_and_cosine
Integral transform useful in probability theory, physics, and engineering
_{0}^{\infty }f(t)e^{-st}\,dt,} where s {\displaystyle s} is a complex number. The Laplace transform is related to many other transforms. It is essentially
Laplace_transform
Length in a vector space
the absolute value x 2 + y 2 {\textstyle {\sqrt {x^{2}+y^{2}}}} of a complex number z = x + i y {\displaystyle z=x+iy} , where x {\displaystyle x} and y
Norm_(mathematics)
2.71828...; base of natural logarithms
real or complex number, is the full solution to the differential equation y ′ = y . {\displaystyle y'=y.} The number e is the unique real number such that
E_(mathematical_constant)
Function returning minus 1, zero or plus 1
be generalized to complex numbers as: sgn z = z | z | {\displaystyle \operatorname {sgn} z={\frac {z}{|z|}}} for any complex number z {\displaystyle
Sign_function
Concepts from linear algebra
multiplying factor λ {\displaystyle \lambda } (possibly a negative or complex number). Geometrically, vectors are multi-dimensional quantities with magnitude
Eigenvalues_and_eigenvectors
Sum of the first n whole number reciprocals; 1/1 + 1/2 + 1/3 + ... + 1/n
the harmonic number for complex values is the unique function that simultaneously satisfies (1) H0 = 0, (2) Hx = Hx−1 + 1/x for all complex numbers x except
Harmonic_number
Line formed by the real numbers
embedded in the complex plane, used as a two-dimensional geometric representation of the complex numbers. The first mention of the number line used for
Number_line
Complex-differentiable (mathematical) function
a complex-valued function of one or more complex variables that is complex differentiable in a neighbourhood of each point in a domain in complex coordinate
Holomorphic_function
Finite extension of the rationals
{\displaystyle r_{2}} for the number of real and complex embeddings used, respectively (see below). Calculating the archimedean places of a number field K {\displaystyle
Algebraic_number_field
Number
rational numbers, real numbers, and complex numbers, as well as other algebraic structures. Multiplying any number by 0 results in 0, and consequently
0
Study of numbers that are not solutions of polynomials with rational coefficients
in the complex numbers. That is, for any non-constant polynomial P {\displaystyle P} with rational coefficients there will be a complex number α {\displaystyle
Transcendental_number_theory
Representation of a quantum mechanical system
{\displaystyle \lambda \psi } (with λ {\displaystyle \lambda } a non-zero complex number) represent the same state. A system with n mutually orthogonal quantum
Bloch_sphere
Product of a number by itself
roots for the negative numbers can be used to expand the real number system to the complex numbers, by postulating the imaginary unit i, which is one of
Square_(algebra)
Mathematical function, denoted exp(x) or e^x
absolutely convergent for every complex number z {\displaystyle z} . So, the complex exponential is an entire function. The complex exponential function is
Exponential_function
Discrete Fourier transform algorithm
a wide range of published theories, from simple complex-number arithmetic to group theory and number theory. The best-known FFT algorithms depend upon
Fast_Fourier_transform
Number which when multiplied by x equals 1
nonzero complex number z = a + bi is complex. It can be found by multiplying both top and bottom of 1 z {\displaystyle {\tfrac {1}{z}}} by its complex conjugate
Multiplicative_inverse
Complex number with rational components
In mathematics, a Gaussian rational number is a complex number of the form p + qi, where p and q are both rational numbers. The set of all Gaussian rationals
Gaussian_rational
Attribute of a mathematical function
mathematics, more specifically complex analysis, the residue of a function at a point of its domain is a complex number proportional to the contour integral
Residue_(complex_analysis)
Number of subsets of a given size
{\displaystyle {\tbinom {n}{k}}=0} . If k is a nonnegative integer and z is any complex number, the first multiplicative formula above can be used to define ( z
Binomial_coefficient
Coordinates comprising a distance and an angle
written as z = x + i y {\displaystyle z=x+iy} . Every complex number represents a point in the complex plane, thereby expressible by specifying either the
Polar_coordinate_system
Complex number that solves a monic polynomial with integer coefficients
algebraic number theory, an algebraic integer is a complex number that is integral over the integers. That is, an algebraic integer is a complex root of
Algebraic_integer
Mathematical identity of polynomials
linear factors of the sum of two squares, using complex number coefficients. For example, the complex roots of z 2 + 4 {\displaystyle z^{2}+4} can be
Difference_of_two_squares
Concept in algebraic number theory
In number theory, Heegner numbers are square-free positive integers d {\displaystyle d} such that the imaginary quadratic field Q ( − d ) {\displaystyle
Heegner_number
Every polynomial has a real or complex root
with complex coefficients has at least one complex root. This includes polynomials with real coefficients, since every real number is a complex number with
Fundamental theorem of algebra
Fundamental_theorem_of_algebra
Mathematical function whose derivative exists
In mathematical analysis, a real or complex function of a single variable is differentiable if its derivative exists at each point in its domain. For
Differentiable_function
Number constructible via compass and straightedge
{\displaystyle q} as a complex number. In the other direction, any formula for an algebraically constructible complex number can be transformed into
Constructible_number
Number expressed in the base-2 numeral system
1938 with Stibitz at the helm. Their Complex Number Computer, completed 8 January 1940, was able to calculate complex numbers. In a demonstration to the
Binary_number
Property determining comparison and ordering
of as the number's distance from zero on the real number line. For example, the absolute value of both 70 and −70 is 70. A complex number z may be viewed
Magnitude_(mathematics)
Infinite integer series where the next number is the sum of the two preceding it
}+4x^{3}+7x^{4}+11x^{5}+\cdots .} This series is convergent for any complex number x {\displaystyle x} satisfying | x | < 1 / φ ≈ 0.618 , {\displaystyle
Lucas_number
Mathematical description of quantum state
mechanical waves. Wave functions are complex-valued. For example, a wave function might assign a complex number to each point in a region of space. The
Wave_function
Complex number whose squared absolute value is a probability
In quantum mechanics, a probability amplitude is a complex number used for describing the behaviour of systems. The square modulus of this quantity at
Probability_amplitude
(3,4) is commonly regarded as a number when it is in the form of a complex number (3+4i), but not when it is in the form of a vector (3,4). This list
List_of_numbers
Method for producing composition algebras
} A complex number whose second component is zero is associated with a real number: the complex number (a, 0) is associated with the real number a. The
Cayley–Dickson_construction
Trigonometric values in terms of square roots and fractions
are integers. This number can be thought of as the real part of the complex number cos ( 2 π k / n ) + i sin ( 2 π k / n ) {\displaystyle \cos(2\pi
Exact_trigonometric_values
Open standard for programming heterogenous computing systems, such as CPUs or GPUs
public: complex_t(T re, T im): m_re{re}, m_im{im} {}; // Define operator for complex-number multiplication. complex_t operator*(const complex_t &other)
OpenCL
Notation for quantum states
a linear map that maps each vector in V {\displaystyle V} to a number in the complex plane C {\displaystyle \mathbb {C} } . Letting the linear functional
Bra–ket_notation
Mathematical equation linking e, i and π
{\displaystyle e^{z}} , where z is any complex number. In general, e z {\displaystyle e^{z}} is defined for complex z by extending one of the definitions
Euler's_identity
Complex matrix A* obtained from a matrix A by transposing it and conjugating each entry
a+ib\equiv {\begin{bmatrix}a&-b\\b&a\end{bmatrix}}.} That is, denoting each complex number z {\displaystyle z} by the real 2 × 2 {\displaystyle 2\times 2} matrix
Conjugate_transpose
Fractal named after mathematician Benoit Mandelbrot
(/ˈmændəlbroʊt, -brɒt/) is a two-dimensional set. It is defined in the complex plane as the complex numbers c {\displaystyle c} for which the function f c ( z )
Mandelbrot_set
Mathematical concept
zero, namely z / 0 = ∞ {\displaystyle z/0=\infty } for any nonzero complex number z {\displaystyle z} . In this context, it is often useful to consider
Infinity
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
Mathematics concept
} α {\displaystyle \alpha } is a complex number, and α ¯ {\displaystyle {\overline {\alpha }}} denotes the complex conjugate of α . {\displaystyle \alpha
Complex conjugate of a vector space
Complex_conjugate_of_a_vector_space
Topics referred to by the same term
Complex modulus may refer to: Modulus of complex number, in mathematics, the norm or absolute value, of a complex number: | x + i y | = x 2 + y 2 {\displaystyle
Complex_modulus
Study of complex manifolds and several complex variables
complex geometry is the study of geometric structures and constructions arising out of, or described by, the complex numbers. In particular, complex geometry
Complex_geometry
Theorem: (cos x + i sin x)^n = cos nx + i sin nx
to complex numbers, the formula is valid even when x is an arbitrary complex number. For x = π 6 {\displaystyle x={\frac {\pi }{6}}} and n = 2 {\displaystyle
De_Moivre's_formula
Four-dimensional number system
In mathematics, the quaternions form a number system similar to the complex numbers, with the usual arithmetical operations of addition, subtraction, multiplication
Quaternion
Topics referred to by the same term
as through a logical quantifier Complex variable, the argument or value of a function of a complex number in complex analysis Variable (research), a logical
Variable
Positional numeral system
arithmetic, a complex-base system is a positional numeral system whose radix is an imaginary (proposed by Donald Knuth in 1955) or complex number (proposed
Complex-base_system
Expression which is not assigned an interpretation
consistent set of mathematics referred to as the complex number plane. Therefore, within the discourse of complex numbers, − 1 {\displaystyle {\sqrt {-1}}} is
Undefined_(mathematics)
In algebraic number theory, a number field is called totally imaginary (or totally complex) if it cannot be embedded in the real numbers. Specific examples
Totally imaginary number field
Totally_imaginary_number_field
Analytic function on the upper half-plane with a certain behavior under the modular group
In number theory and complex analysis, a modular form is a type of function of a complex number variable that possesses a high degree of symmetry, of a
Modular_form
Mathematical object studied in the field of algebraic geometry
object) in one variable with complex number coefficients is determined by the set of its roots (a geometric object) in the complex plane. Generalizing this
Algebraic_variety
Function with a repeating pattern
nonzero rational number serving as a period. However, it does not possess a fundamental period. Functions with a domain in the complex numbers can exhibit
Periodic_function
C standard library header file
a new _Complex keyword (and complex convenience macro; only available if the <complex.h> header is included) that provides support for complex numbers
C_mathematical_functions
Concept in complex analysis
In complex analysis (a branch of mathematics), a pole is a certain type of singularity of a complex-valued function of a complex variable. It is the simplest
Zeros_and_poles
Topics referred to by the same term
Re function, in mathematics, where Re(z) denotes the real part of a complex number z .re, the Internet country code top-level domain for Réunion Ré (futsal
Re
Function in analytic number theory
of analytic number theory, the Dirichlet eta function is defined by the following Dirichlet series, which converges for any complex number having real
Dirichlet_eta_function
Number of times a curve wraps around a point in the plane
of complex analysis, the winding number of a closed curve γ {\displaystyle \gamma } in the complex plane can be expressed in terms of the complex coordinate
Winding_number
Numbers expressible as integrals of algebraic functions
In mathematics, specifically number theory, a period or algebraic period is a complex number that can be expressed as an integral of an algebraic function
Period_(number_theory)
Two geometries based on axioms closely related to those specifying Euclidean geometry
in the split-complex plane correspond to angle in Euclidean geometry. Indeed, they each arise in polar decomposition of a complex number z. Hyperbolic
Non-Euclidean_geometry
{\displaystyle \mathbb {C} _{1}} is the complex number system, C 2 {\displaystyle \mathbb {C} _{2}} is the bicomplex number system, C 3 {\displaystyle \mathbb
Multicomplex_number
Algebraic operation on coordinate vectors
The inner product of two vectors over the field of complex numbers is, in general, a complex number, and is sesquilinear instead of bilinear. An inner
Dot_product
COMPLEX NUMBER
COMPLEX NUMBER
Boy/Male
Tamil
Poornan | பூரà¯à®¨à®¾à®¨
Complete
Poornan | பூரà¯à®¨à®¾à®¨
Girl/Female
Tamil
Sompurna | ஸோமபà¯à®°à¯à®¨à®¾
Complete
Sompurna | ஸோமபà¯à®°à¯à®¨à®¾
Girl/Female
Tamil
Complete
Surname or Lastname
English (Yorkshire)
English (Yorkshire) : habitational name from any of various places called Copley, for example in County Durham, Staffordshire, and Yorkshire, from the Old English personal name Coppa (apparently a byname for a tall man) or from copp ‘hilltop’ + lēah ‘woodland clearing’.
Boy/Male
Tamil
Complete
Girl/Female
Arabic, Muslim
Complex; Zigzag; Curling
Girl/Female
Hindu, Indian
Complex
Girl/Female
Bengali, Indian
Good Complex
Boy/Male
Indian
Complete
Surname or Lastname
English
English : habitational name, probably from Comley in Shropshire or Combley on the Isle of Wight; both are named with Old English cumb ‘valley’ + lēah ‘woodland clearing’.
Surname or Lastname
English
English : habitational name from Coppull in Lancashire, recorded in the 13th century as Cophill, from Old English copp ‘peak’ + hyll ‘hill’.English : nickname from Old French curt peil ‘short hair’.Probably an Americanized spelling of German and Jewish Koppel or German and Dutch Kappel.
Boy/Male
Tamil
Complete
Girl/Female
Tamil
Complete
Girl/Female
Muslim
Complex, Zigzag, Curling
Boy/Male
Indian
Complete
Boy/Male
Tamil
Complete
Surname or Lastname
English
English : unexplained.Americanized form of German Koppler.
Girl/Female
Tamil
Complete
Girl/Female
Tamil
Complete
Girl/Female
Tamil
Shesha Harani | ஷேஷ ஹரணீÂ
Complete
COMPLEX NUMBER
COMPLEX NUMBER
Girl/Female
Irish
Graceful.
Biblical
a thorn
Girl/Female
Muslim/Islamic
Generous blessing of Allah
Female
English
Variant spelling of English Abigail, ABAGAIL means "father rejoices."
Girl/Female
American, Australian, British, Chinese, Christian, Danish, Dutch, English, French, German, Greek, Irish, Latin
Pearl; Child of Light; Variation of Margaret
Girl/Female
Arabic, Australian
Bless
Surname or Lastname
English
English : variant of Bowerman.
Boy/Male
British, Christian, English, French, German
From the Old English Ealdwine; A Common Name in the Middle Ages; Wise Friend
Surname or Lastname
German
German : topographic name for someone who lived by a tree that was particularly noticeable in some way, from Middle High German, Old High German boum ‘tree’, or else a nickname for a particularly tall person.Jewish (Ashkenazic) : ornamental name from German Baum ‘tree’, or a short form of any of the many ornamental surnames containing this word as the final element, for example Feigenbaum ‘fig tree’ (see Feige) and Mandelbaum ‘almond tree’ (see Mandel).English : probably a variant spelling of Balm, a metonymic occupational name for a seller of spices and perfumes, Middle English, Old French basme, balme, ba(u)me ‘balm’, ‘ointment’ (see Balmer).
Surname or Lastname
English
English : patronymic from the personal name Rollo or Rolf.
COMPLEX NUMBER
COMPLEX NUMBER
COMPLEX NUMBER
COMPLEX NUMBER
COMPLEX NUMBER
a.
Repeatedly compound; made up of complex constituents.
n.
Two taken together; a pair or couple; especially two lines of verse that rhyme with each other.
a.
See Couple-close.
pl.
of Couple-close
adv.
In a complex manner; not simply.
imp. & p. p.
of Comply
a.
Intricate; entangled; complicated; complex.
v. t.
To bring to a state in which there is no deficiency; to perfect; to consummate; to accomplish; to fulfill; to finish; as, to complete a task, or a poem; to complete a course of education.
imp. & p. p.
of Compile
n.
A complex; an aggregate of parts; a complication.
imp. & p. p.
of Couple
n.
One who compiles; esp., one who makes books by compilation.
n.
One who couples; that which couples, as a link, ring, or shackle, to connect cars.
n.
Composed of two or more parts; composite; not simple; as, a complex being; a complex idea.
a.
One of the pairs of plates of two metals which compose a voltaic battery; -- called a voltaic couple or galvanic couple.
a.
Finished; ended; concluded; completed; as, the edifice is complete.
a.
That which joins or links two things together; a bond or tie; a coupler.
a.
Not complex; uncompounded; simple.
n.
One who complies, yields, or obeys; one of an easy, yielding temper.
a.
Complex, complicated.