Suppose that a funetion x_k(t) is generated by superposition of k periodie funetions f_i(t), i=1, 2,…,k, while τ_i is the length of the period of function f_i(t), i.e.
文摘Suppose that a funetion x_k(t) is generated by superposition of k periodie funetions f_i(t), i=1, 2,…,k, while τ_i is the length of the period of function f_i(t), i.e.
