Lipschitz

Etymology
Named after Rudolf Lipschitz.

Adjective

 * 1)  (Of a real-valued real function $$f$$) Such that there exists a constant $$K$$ such that whenever $$x_1$$ and $$x_2$$ are in the domain of $$f$$, $$|f(x_1)-f(x_2)|\leq K|x_1-x_2|$$.