四色定理    

        1、工作原理    四色定理是一道经典的数学问题，如何用四种颜色分别区分各地区及领域？本展品通过单片机控制，选择、确定等程序，利用红、紫、蓝、绿四种颜色和中国地图各行政区域（32个）的划分，显示证明了此定理的正确。2、操作方法    观众操作控制部分（1）选择发光器的颜色（触摸器），（2）在触摸所确定选择的区域，该区域根据所选择的颜色发光器接通。按此种顺序继续选择、确定，将全部中国地图各个行政区域选择完毕。

FOUR COLOR PROPOSITION    

        1、Working Principle    Four-color proposition is a classic mathematic problem. How to divide neighboring countries or regions on a map by using of four different colors? The exhibit uses chip microprocessors to control the color-select and OK functions. This example shows the correctness of four-color proposition by using Red, Yellow, Blue and Green color and China Region Map (32 parts)    2、peration    Visitors operates the control part (1) Choose one color on the Touch Panel; (2) and then touch the region you would like to add the color on it. And continue to finish all the regions to add different colors.