An equation is a mathematical statement showing that two expressions are equal. The two expressions are linked with an equals symbol (=). The unknown variable (often the letter \(x\)) can take any ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 77, No. 9, [Part 1: Physical Sciences] (Sep., 1980), pp. 5025-5027 (3 pages) It is shown that any Backlund ...

A homogeneous linear difference equation with constant coefficients over a locally compact abelian group $G$ is an equation of the form $\sum^n_{j=1} c_jf (t_jx) = 0 ...

THE main work of mathematical physicists is to represent the sequence of phenomena in time and space by means of differential equations, and to solve these equations. Even the revolution effected by ...