(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

(physics) A relativistic wave equation that describes an electron (and similar particles); it predicted the existence of antiparticles

plural of differential equation

(chemistry) Either of two equations that describe each half of a redox reaction

(mathematics) An equation defining a curve in terms of radius and angle.

(mathematics) A type of equation which includes a variable located in the exponent; for example, eˣ=1,.

plural of Arrhenius equation

(mathematics) An equation involving an ordered sequence of real numbers (a_nₙ₌₁ ᪲) and some of its differences, where the first difference is defined as 𝛥(a_n)=a_n+1-a_n, and the kᵗʰ difference is defined recursively as 𝛥ᵏ(a_n)=𝛥ᵏ⁻¹(a_n+1)-𝛥ᵏ⁻¹(a_n),.