“象称函数”初探３０１８００天津市宝坻县教研室杨之关于函数奇偶性概念，有两个问题：一是奇偶函数类太窄，以至于图象具有对称性的许多函数，如一、二次函数．正弦函数在一般情形下．都不具有奇偶性．二是对奇偶函数略加变换就可能失去奇偶性．因此有必要拓广奇偶性概... “Image-like function” preliminary study 301800, Baodi County, Tianjin, Yang Yang, on the concept of function parity, there are two problems: First, the odd-even function class is too narrow, so that the image has many functions of symmetry, such as a quadratic function. Sine function under normal circumstances. None of them have parity. The second possibility is that parity may be lost by slightly adding a parity function. So it is necessary to broaden the parity...