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equation US English

A statement that the values of two mathematical expressions are equal (indicated by the sign =)

equation US Thesaurus

a quadratic equation

gas equation US English

The equation of state of an ideal gas, PV = nRT, where P = pressure, V = volume, T = absolute temperature, R = the gas constant, and n = the number of moles of gas

wave equation US English

A differential equation expressing the properties of motion in waves

Drake equation US English

A speculative equation that gives an estimate of the likelihood of discovering intelligent extraterrestrial life in the galaxy, expressed as the product of a series of factors such as the number of stars, the fraction of stars with planets, the fraction of planets on which life evolves, the average lifetime of a civilization, etc. It was formulated by the US astronomer Frank Drake in 1961

linear equation US English

An equation between two variables that gives a straight line when plotted on a graph

differential equation US English

An equation involving derivatives of a function or functions

Diophantine equation US English

A polynomial equation with integral coefficients for which integral solutions are required

equation of state US English

An equation showing the relationship between the values of the pressure, volume, and temperature of a quantity of a particular substance

equation of time US English

The difference between mean solar time (as shown by clocks) and apparent solar time (indicated by sundials), which varies with the time of year

Schrödinger equation US English

A differential equation that forms the basis of the quantum-mechanical description of matter in terms of the wavelike properties of particles in a field. Its solution is related to the probability density of a particle in space and time

partial differential equation US English

An equation containing one or more partial derivatives

equation of the first order, US English

An equation involving only the first derivative, second derivative, etc.

the equation in equation US English

A situation or problem in which several factors must be taken into account

Maxwell's equations US English

A set of four linear partial differential equations that summarize the classical properties of the electromagnetic field

simultaneous equations US English

Equations involving two or more unknowns that are to have the same values in each equation

equation of the first order, in equation US English

An equation involving only the first derivative, second derivative, etc.

equation of the first order, second order, etc. in equation US English

An equation involving only the first derivative, second derivative, etc.