Abstract: | In this paper, we discussed further the Padé approximants, and proved P n(x)/Q n(x) is the function f(x) 's Padé approximant at x=0 (where P n(x), Q n(x) are all polynomial of degree n ) and Q n(x)=P n(-x) if and only if f(x)·f(-x)=1 , therefore the calculation quantity of the kinds of functions's Padé approximants decrease to half. |