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Mathematical formula expressing equality
an equation is a mathematical formula that expresses the equality of two expressions, by connecting them with the equals sign =. The word equation and
Equation
Equation to derive time of sunset and sunrise
The sunrise equation or sunset equation can be used to derive the time of sunrise or sunset for any solar declination and latitude in terms of local solar
Sunrise_equation
Type of functional equation (mathematics)
In mathematics, a differential equation is an equation that relates one or more unknown functions and their derivatives. In applications, the functions
Differential_equation
Description of a quantum-mechanical system
The Schrödinger equation is a partial differential equation that governs the wave function of a non-relativistic quantum-mechanical system. Its discovery
Schrödinger_equation
Topics referred to by the same term
Characteristic equation may refer to: Characteristic equation (calculus), used to solve linear differential equations Characteristic equation, the equation obtained
Characteristic_equation
Differential equation for the description of waves or standing wave
The wave equation is a second-order linear partial differential equation for the description of waves or standing wave fields such as mechanical waves
Wave_equation
Empirical model for microorganisms growth limited by a nutrient
The Monod equation is a mathematical model for the growth of microorganisms. It is named for Jacques Monod (1910–1976, a French biochemist, Nobel Prize
Monod_equation
particular in the theory of solitons, the Dym equation (HD) is the third-order partial differential equation u t = u 3 u x x x . {\displaystyle u_{t}=u^{3}u_{xxx}
Dym_equation
Elliptic partial differential equation
Poisson's equation is an elliptic partial differential equation of broad utility in theoretical physics. For example, the solution to Poisson's equation is the
Poisson's_equation
Polynomial equation of degree two
In mathematics, a quadratic equation (from Latin quadratus 'square') is an equation that can be rearranged in standard form as a x 2 + b x + c = 0 , {\displaystyle
Quadratic_equation
Second-order partial differential equation
In mathematics and physics, Laplace's equation is a second-order partial differential equation named after Pierre-Simon Laplace, who first studied its
Laplace's_equation
Partial differential equation describing the evolution of temperature in a region
specifically thermodynamics), the heat equation is a parabolic partial differential equation. The theory of the heat equation was first developed by Joseph Fourier
Heat_equation
In filtering theory the Kushner equation (after Harold Kushner) is an equation for the conditional probability density of the state of a stochastic non-linear
Kushner_equation
Representation of water movement in unsaturated soils
Richards equation represents the movement of water in unsaturated soils, and is attributed to Lorenzo A. Richards who published the equation in 1931.
Richards_equation
Polynomial equation of degree 3
In algebra, a cubic equation in one variable is an equation of the form a x 3 + b x 2 + c x + d = 0 {\displaystyle ax^{3}+bx^{2}+cx+d=0} in which a is
Cubic_equation
Relativistic wave description of fermions
In physics, the Majorana equation is a relativistic wave equation. It is named after the Italian physicist Ettore Majorana, who proposed it in 1937 as
Majorana_equation
Böttcher's equation, named after Lucjan Böttcher, is the functional equation F ( h ( z ) ) = ( F ( z ) ) n {\displaystyle F(h(z))=(F(z))^{n}} where h
Böttcher's_equation
Saturation vapour pressure of water calculation
The Tetens equation is an equation to calculate the saturation vapour pressure of water over liquid and ice. It is named after its creator, O. Tetens
Tetens_equation
Description of the time-evolution of plasma
In plasma physics, the Vlasov equation is a differential equation describing the time evolution of the distribution function of a collisionless plasma
Vlasov_equation
Equation in fluid dynamics
In fluid dynamics, the Darcy–Weisbach equation is an empirical equation that relates the head loss, or pressure loss, due to viscous shear forces along
Darcy–Weisbach_equation
Power loss in magnetic materials
Steinmetz's equation, sometimes called the power equation, is an empirical equation used to calculate the total power loss (core losses) per unit volume
Steinmetz's_equation
Necessary condition for optimality associated with dynamic programming
A Bellman equation, named after Richard E. Bellman, is a technique in dynamic programming which breaks an optimization problem into a sequence of simpler
Bellman_equation
Estimate of extraterrestrial civilizations
The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way Galaxy
Drake_equation
Mathematical equation describing the motion of a rocket
The classical rocket equation, Tsiolkovsky rocket equation, or ideal rocket equation is a mathematical equation that describes the motion of vehicles that
Tsiolkovsky_rocket_equation
Equation that does not involve powers or products of variables
In mathematics, a linear equation is an equation that may be put in the form a 1 x 1 + … + a n x n + b = 0 , {\displaystyle a_{1}x_{1}+\ldots +a_{n}x_{n}+b=0
Linear_equation
Ruze's equation is an equation relating the gain of an antenna to the root mean square (RMS) of the antenna's random surface errors. The equation was originally
Ruze's_equation
Zakai equation is a linear stochastic partial differential equation for the un-normalized density of a hidden state. In contrast, the Kushner equation gives
Zakai_equation
Equations describing classical electromagnetism
Maxwell's equations are a set of coupled partial differential equations that describe how electric and magnetic fields are generated by electric charges
Maxwell's_equations
Formula for the degree of polymerization
In step-growth polymerization, the Carothers equation (or Carothers' equation) gives the degree of polymerization, Xn, for a given fractional monomer conversion
Carothers_equation
Topics referred to by the same term
up equation in Wiktionary, the free dictionary. An equation in mathematics is a formula stating that two expressions have the same value. Equation may
Equation_(disambiguation)
Eigenvalue problem for the Laplace operator
wave equation, the diffusion equation, and the Schrödinger equation for a free particle. In optics, the Helmholtz equation is the wave equation for the
Helmholtz_equation
Calculation involving electrolyte solutions
validity of the Debye–Hückel equation. This equation, together with Specific ion interaction theory (SIT) and Pitzer equations is important for the understanding
Bromley_equation
Formula for temperature dependence of rates of chemical reactions
In physical chemistry, the Arrhenius equation is a formula for the temperature dependence of reaction rates. In 1889 while working with Wilhelm Ostwald
Arrhenius_equation
Polynomial equation whose integer solutions are sought
Diophantine equation is a polynomial equation with integer coefficients, for which only integer solutions are of interest. A linear Diophantine equation equates
Diophantine_equation
Stochastic differential equation
In physics, a Langevin equation (named after Paul Langevin) is a stochastic differential equation describing how a system evolves when subjected to a combination
Langevin_equation
Polynomial equation of degree 4
mathematics, a quartic equation is one which can be expressed as a quartic function equaling zero. The general form of a quartic equation is a x 4 + b x 3 +
Quartic_equation
Partial differential equation
mechanics and information theory, the Fokker–Planck equation is a partial differential equation that describes the time evolution of the probability
Fokker–Planck_equation
Equations of motion for viscous fluids
Navier–Stokes equations (/nævˈjeɪ ˈstoʊks/ nav-YAY STOHKS) describe the motion of viscous fluids. This system of partial differential equations was named
Navier–Stokes_equations
Type of differential equation
In mathematics, a Riccati equation in the narrowest sense is any first-order ordinary differential equation that is quadratic in the unknown function
Riccati_equation
The Inhour equation used in nuclear reactor kinetics to relate reactivity and the reactor period. Inhour is short for "inverse hour" and is defined as
Inhour_equation
Type of Diophantine equation
Pell's equation, also called the Pell–Fermat equation, is any Diophantine equation of the form x 2 − n y 2 = 1 , {\displaystyle x^{2}-ny^{2}=1,} where
Pell's_equation
Discontinuity in linear measurement
A milepost equation, milepoint equation, or postmile equation is a place where mileposts on a linear feature, such as a highway or rail line, fail to increase
Milepost_equation
Fourth-order PDE in continuum mechanics
In mathematics, the biharmonic equation is a fourth-order partial differential equation which arises in areas of continuum mechanics, including linear
Biharmonic_equation
In graph theory, Graph equations are equations in which the unknowns are graphs. One of the central questions of graph theory concerns the notion of isomorphism
Graph_equation
Empirical adsorption isotherm
The Freundlich equation or Freundlich adsorption isotherm, an adsorption isotherm, is an empirical relationship between the quantity of a gas adsorbed
Freundlich_equation
The Kawahara equation is a partial differential equation that arises in various fields of mathematical physics, particularly in the study of wave phenomena
Kawahara_equation
Chemistry concept
(0.171 moles of NaCl). Mathematically this relationship can be shown by equation: c 1 V 1 = c 2 V 2 {\displaystyle c_{1}V_{1}=c_{2}V_{2}} where c1 = initial
Dilution_(equation)
Basic concepts of algebra
quantitative relationships in science and mathematics are expressed as algebraic equations. In mathematics, a basic algebraic operation is a mathematical operation
Elementary_algebra
Cyber attack group
The Equation Group, also known in China as APT-C-40, is a highly sophisticated threat actor. Kaspersky Labs describes them as one of the most sophisticated
Equation_Group
Relativistic quantum mechanical wave equation
In particle physics, the Dirac equation is a relativistic wave equation derived by British physicist Paul Dirac in 1928. In its free form, or including
Dirac_equation
Heuristic formula to explain determinants of behavior
Lewin's equation, B = f(P, E), is a heuristic formula proposed by psychologist Kurt Lewin as an explanation of what determines behavior. The formula states
Lewin's_equation
Fundamental equation relating accounting quantities
The fundamental accounting equation, also called the balance sheet equation, is the foundation for the double-entry bookkeeping system and the cornerstone
Accounting_equation
probability, the Belavkin equation, also known as Belavkin-Schrödinger equation, quantum filtering equation, stochastic master equation, is a quantum stochastic
Belavkin_equation
equation is an integrable nonlinear partial differential equation introduced by the mathematician Clifford Gardner in 1968 to generalize KdV equation
Gardner_equation
Type of differential equation
In mathematics, a partial differential equation (PDE) is an equation which involves a multivariable function and one or more of its partial derivatives
Partial_differential_equation
Symbolic representation of a chemical reaction
A chemical equation is the symbolic representation (notation) of a chemical reaction in the form of symbols and chemical formulas. The reactant entities
Chemical_equation
Relation between chemical reaction rate and concentrations of the reactants
In chemistry, the rate equation (also known as the rate law or empirical differential rate equation) is an empirical differential mathematical expression
Rate_equation
Apparent solar time minus mean solar time
The equation of time describes the discrepancy between two kinds of solar time. The two times that differ are the apparent solar time, which directly tracks
Equation_of_time
Theorem in probability theory
In probability theory, Wald's equation, Wald's identity or Wald's lemma is an important identity that simplifies the calculation of the expected value
Wald's_equation
Thermodynamic equation
equation is a class of semi-empirical correlations describing the relation between vapor pressure and temperature for pure substances. The equation was
Antoine_equation
Principle relating to fluid dynamics
speed increases, it was Leonhard Euler in 1752 who derived Bernoulli's equation in its usual form. Bernoulli's principle can be derived from the principle
Bernoulli's_principle
Non-linear partial differential equation encountered in problems of wave propagation
An eikonal equation (from Greek εἰκών, image) is a non-linear first-order partial differential equation that is encountered in problems of wave propagation
Eikonal_equation
Non-linear second order differential equation and its attractor
The Duffing equation (or Duffing oscillator), named after Georg Duffing (1861–1944), is a non-linear second-order differential equation used to model
Duffing_equation
The Wannier equation describes a quantum mechanical eigenvalue problem in solids where an electron in a conduction band and an electronic vacancy (i.e
Wannier_equation
Formula in X-ray diffraction and crystallography
The Scherrer equation, in X-ray diffraction and crystallography, is a formula that relates the size of sub-micrometre crystallites in a solid to the broadening
Scherrer_equation
In mathematics, Tanaka's equation is an example of a stochastic differential equation which admits a weak solution but has no strong solution. It is named
Tanaka_equation
Equation of statistical mechanics
The Boltzmann equation or Boltzmann transport equation (BTE) describes the statistical behaviour of a thermodynamic system not in a state of equilibrium;
Boltzmann_equation
Differential equation containing derivatives with respect to only one variable
In mathematics, an ordinary differential equation (ODE) is a differential equation (DE) dependent on only a single independent variable. As with any other
Ordinary differential equation
Ordinary_differential_equation
Relation between friction factor and Reynolds number
The Ergun equation, derived by the Turkish chemical engineer Sabri Ergun in 1952, expresses the friction factor in a packed column as a function of the
Ergun_equation
Equation that describes density changes of a material that is diffusing in a medium
The diffusion equation is a parabolic partial differential equation. In physics, it describes the macroscopic behavior of many micro-particles in Brownian
Diffusion_equation
Equation describing the transport of some quantity
A continuity equation or transport equation is an equation that describes the transport of some quantity. It is particularly simple and powerful when
Continuity_equation
Fictional mind control formula in DC Comics
Anti-Life Equation is a fictional concept appearing in American comic books published by DC Comics. Various comics have defined the equation in different
Anti-Life_Equation
Model used to describe wear
Archard wear equation is a simple model used to describe sliding wear and is based on the theory of asperity contact. The Archard equation was developed
Archard_equation
Law describing the pressure drop in an incompressible and Newtonian fluid
dynamics, the Hagen–Poiseuille equation, also known as the Hagen–Poiseuille law, Poiseuille law or Poiseuille equation, is a physical law that gives the
Hagen–Poiseuille_equation
Field-equations in general relativity
field equations (EFE; also known as Einstein's equations) relate the geometry of spacetime to the distribution of matter-energy within it. The equations were
Einstein_field_equations
Topics referred to by the same term
Logistic equation can refer to: Logistic function, a common S-shaped equation and curve with applications in a wide range of fields. Logistic map, a nonlinear
Logistic_equation
Equations with an unknown function under an integral sign
integral equations are equations in which an unknown function appears under an integral sign. In mathematical notation, integral equations may thus be
Integral_equation
Chemical kinetics equation
The Eyring equation (occasionally also known as Eyring–Polanyi equation) is an equation used in chemical kinetics to describe changes in the rate of a
Eyring_equation
Equation for the force of drag
drag equation is a formula used to calculate the force of drag experienced by an object due to movement through a fully enclosing fluid. The equation is:
Drag_equation
Empirical relationship between refractive index and wavelength
Sellmeier equation is an empirical relationship between refractive index and wavelength for a particular transparent medium. The equation is used to
Sellmeier_equation
Polynomial equation, generally univariate
In mathematics, an algebraic equation or polynomial equation is an equation of the form P = 0 {\displaystyle P=0} , where P is a polynomial, usually with
Algebraic_equation
Functional equation Functional equation (L-function) Constitutive equation Laws of science Defining equation (physical chemistry) List of equations in classical
List_of_equations
In Combustion, G equation is a scalar G ( x , t ) {\displaystyle G(\mathbf {x} ,t)} field equation which describes the instantaneous flame position, introduced
G_equation
Description of how a trait or gene changes in frequency over time
the theory of evolution and natural selection, the Price equation (also known as Price's equation or Price's theorem) describes how a "characteristic" of
Price_equation
Equations in physical cosmology
The Friedmann equations, also known as the Friedmann–Lemaître (FL) equations, are a set of equations in physical cosmology that govern cosmic expansion
Friedmann_equations
The Ishimori equation is a partial differential equation proposed by the Japanese mathematician Ishimori (1984). Its interest is as the first example
Ishimori_equation
Finding values for variables that make an equation true
the equation becomes an equality. A solution of an equation is often called a root of the equation, particularly but not only for polynomial equations. The
Equation_solving
Quantum mechanical equation of motion of charged particles in magnetic field
In quantum mechanics, the Pauli equation or Schrödinger–Pauli equation is the formulation of the Schrödinger equation for spin-1/2 particles, which takes
Pauli_equation
Mathematical description of fluid movements
endocapillary layer is called the endothelial glycocalyx. The Starling equation describes that relationship in mathematical form and can be applied to
Starling_equation
Orbital mechanics term
In orbital mechanics, Kepler's equation relates various geometric properties of the orbit of a body subject to a central force. It was derived by Johannes
Kepler's_equation
Physical law in electrochemistry
In electrochemistry, the Nernst equation is a chemical thermodynamical relationship that permits the calculation of the reduction potential of a reaction
Nernst_equation
Relativistic wave equation in quantum mechanics
In particle physics, the Klein–Gordon equation is a relativistic wave equation for spinless particles. It was discovered 1926 as the relativistic generalization
Klein–Gordon_equation
a given temperature. Another similar equation based on more recent data is the Arden Buck equation. This equation is named after the authors of the original
Goff–Gratch_equation
Differential equation exhibiting high rate of dissipation
In computational mathematics, a stiff equation is an initial value problem u ˙ = f ( u ) , u ( 0 ) = u 0 , t ∈ [ 0 , T ] , {\displaystyle {\dot {u}}=f(u)\
Stiff_equation
Formulation of classical mechanics
This constraint allows the calculation of the equations of motion of the system using Lagrange's equations. Newton's laws and the concept of forces are
Lagrangian_mechanics
Optimality condition in optimal control theory
The Hamilton-Jacobi-Bellman (HJB) equation is a nonlinear partial differential equation that provides necessary and sufficient conditions for optimality
Hamilton–Jacobi–Bellman equation
Hamilton–Jacobi–Bellman_equation
Topics referred to by the same term
An elliptic equation can mean: The equation of an ellipse An elliptic curve, describing the relationships between invariants of an ellipse A differential
Elliptic_equation
Diagram showing the proportion of a receptor bound to a ligand
In biochemistry and pharmacology, the Hill equation refers to two closely related equations that reflect the binding of ligands to macromolecules, as a
Hill_equation_(biochemistry)
In mathematics, the Ince equation, named for Edward Lindsay Ince, is the differential equation w ′ ′ + ξ sin ( 2 z ) w ′ + ( η − p ξ cos ( 2 z ) )
Ince_equation
Representation of a curve by a function of a parameter
In mathematics, a parametric equation expresses several quantities, such as the coordinates of a point, as functions of one or more variables called parameters
Parametric_equation
EQUATION
EQUATION
EQUATION
EQUATION
Girl/Female
Latin
Dark.
Girl/Female
Greek
Dear sister.
Boy/Male
Tamil
Jasvindar | ஜஸவிஂதர
Lord of glory
Surname or Lastname
English (mainly Yorkshire)
English (mainly Yorkshire) : nickname for a peasant who gave himself airs and graces, from Anglo-Norman French segneur ‘lord’ (Latin senior ‘elder’).English and Dutch : distinguishing nickname for the elder of two bearers of the same personal name (for example, a father and son or two brothers), from Latin senior ‘elder’.
Male
Russian
Variant spelling of Russian Bogatyr, BOGATIR means "hero" or "warrior."
Boy/Male
Hindu, Indian
Green
Girl/Female
Arabic, Muslim, Pakistani, Urdu
Flower
Boy/Male
Bengali, Celebrity, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Mythological, Sanskrit, Sindhi, Tamil, Telugu, Traditional
Love; Cute; Head of God; Protector of Cows; Lord Krishna
Girl/Female
Hindu, Indian, Traditional
An Apsara
Girl/Female
Australian, British, Danish, Dutch, English, Finnish, French, German, Swedish, Teutonic
Power; Spear; From the Protected Farm; Diminutive of Gertrude; Strength of the Spear; Spear Maiden
EQUATION
EQUATION
EQUATION
EQUATION
EQUATION
n.
A spiral whose polar equation is r2/ = a; that is, a curve the square of whose radius vector varies inversely as the angle which the radius vector makes with a given line.
n.
Either of the two parts of an algebraic equation, connected by the sign of equality.
n.
A quantity which may increase or decrease; a quantity which admits of an infinite number of values in the same expression; a variable quantity; as, in the equation x2 - y2 = R2, x and y are variables.
n.
The system of equations required for the complete expression of the relations which exist between a set of quantities.
a.
Recurring once a month; monthly; gone through in a month; as, the menstrual revolution of the moon; pertaining to monthly changes; as, the menstrual equation of the sun's place.
n.
The act of solving, or the state of being solved; the disentanglement of any intricate problem or difficult question; explanation; clearing up; -- used especially in mathematics, either of the process of solving an equation or problem, or the result of the process.
n.
A surface whose equation in three variables is of the second degree. Spheres, spheroids, ellipsoids, paraboloids, hyperboloids, also cones and cylinders with circular bases, are quadrics.
n.
The division of the terms of an equation by a known quantity that is involved in the first term.
n.
That branch of algebra which treats of quadratic equations.
n.
The change, as of an equation or quantity, into another form without altering the value.
n.
Rank; degree; thus, the order of a curve or surface is the same as the degree of its equation.
n.
The curve whose ordinates are proportional to the sines of the abscissas, the equation of the curve being y = a sin x. It is also called the curve of sines.
n.
Belonging to number; denoting number; consisting in numbers; expressed by numbers, and not letters; as, numerical characters; a numerical equation; a numerical statement.
a.
Pertaining to terms of the second degree; as, a quadratic equation, in which the highest power of the unknown quantity is a square.
n.
An identical equation.
n.
A curve of the fourth degree, invented by Pascal. Its polar equation is r = a cos / + b.
v. t.
To bring, as any term of an equation, from one side over to the other, without destroying the equation; thus, if a + b = c, and we make a = c - b, then b is said to be transposed.
n.
A curve or surface whose equation is of the fourth degree in the variables.
n.
The bringing of any term of an equation from one side over to the other without destroying the equation.
n.
An expression of the condition of equality between two algebraic quantities or sets of quantities, the sign = being placed between them; as, a binomial equation; a quadratic equation; an algebraic equation; a transcendental equation; an exponential equation; a logarithmic equation; a differential equation, etc.