ディオファントス方程式
A Diophantine equation is a polynomial equation in two or more unknowns for which only the integer solutions are sought (an integer solution is a solution such that all the unknowns take integer values). A linear Diophantine equation is an equation between two sums of monomials of degree zero or one. An example of linear Diophantine equation is where "a", "b", and "c" are constants. An exponential Diophantine equation is one for which exponents of the terms of the equation can be unknowns.