Let r be a positive integer. Let f(x, y) be a continuous function defined for 0≤x≤1, -∞<y<∞, and having continuous partial derivatives with respect to x, of order up to r, and periodic
文摘Let r be a positive integer. Let f(x, y) be a continuous function defined for 0≤x≤1, -∞<y<∞, and having continuous partial derivatives with respect to x, of order up to r, and periodic
