plural of difference equation

plural of equation of time

plural of equation division

plural of half-equation

plural of parametric equation

plural of polynomial equation

plural of Riccati equation

plural of system of equations

(mathematics, physics, potential theory) The partial differential equation (∂²𝜑)/(∂x_1²)+(∂²𝜑)/(∂x_2²)+⋯+(∂²𝜑)/(∂x_n²)=0, commonly written 𝛥𝜑=0 or ∇²𝜑=0, where 𝛥(=∇²) is the Laplace operator and 𝜑 is a scalar function.

The heuristic formula B=f(P,E), stating that behavior is a function of the person and their environment.