lemma of duBois-Reymond

lemma of duBois-Reymond

[′lem·ə əv dyu̇b′wä rā′mōn]
(mathematics)
A continuous function ƒ(x) is constant in the interval (a,b) if for certain functions g whose integral over (a,b) is zero, the integral over (a,b) of ƒ times g is zero.