(mathematics) A polynomial equation of the first degree (such as x = 2y - 7)

(mathematics) A polynomial equation whose greatest exponent is 3.

(number theory) A polynomial equation whose variables are only permitted to assume integer values.

plural of Diophantine equation

plural of celestial equator

(astronomy) A great circle on the celestial sphere, coincident with the plane of earth's equator.

plural of exponential equation

(mathematics) a set of equations required to be satisfied simultaneously or considered as a whole

(quantum mechanics) In nonrelativistic quantum mechanics, a partial differential equation that describes how the quantum state of some physical system changes with time.

(mathematics) finite sets of equations whose common solutions are sought