脉冲fredholm积分方程 impulsive fredholm integral equation ; impulsive fredholm equations ; nolonear fredholm integral equation

非线性fredholm积分方程 nonlinear fredholm integral equation

fredholm积分方程组 fredholm integral systems ; system of fredholm integral equations

Fredholm积分方程组 systems of Fredholm integral equations

第一类fredholm积分方程 first kind fredholm integral equation

第二类fredholm积分方程 second kind fredholm integral equation ; second kind fredholm integral equations