The number e, sometimes called Euler's number or Napier's constant, is one of the most important Numbers in mathematics.
数字e有时候也被称为欧拉系数或者欧拉常数，是数学运算中非常重要的数字之一。
In this paper, Euler's formula and Handshaking lemma is used to obtain the face chromatic number of a planar graph by solving equations.
本文在前人研究的面着色问题基础上，运用欧拉公式和握手定理通过解方程组得到连通平面图的面色数。
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