... can be proved by similar procedures.We must remember that the terms , and so on, represent the initial conditions.Therefore, when all initial conditions are zero, and we differentiate a time function ... parameter is defined by the equation where f is someknown function of integration x and the parameter , a and b are constants independent of x and , and the par-tial derivative exists and it ... getNext, we interchange the order of integration, i .e. , and performing the inner integration on the right side integral with respect to , we get9. Time PeriodicityThe time periodicity property...