Is the Four Color Theorem True?

Because the four color theorem is true, this is always possible; however, because the person drawing the map is focused on the one large region, they fail to notice that the remaining regions can in fact be colored with three colors.

Is the four color theorem proved?

Abstract: A formal proof has not been found for the four color theorem since 1852 when Francis Guthrie first conjectured the four color theorem. ... The formal proof proposed can also be regarded as an algorithm to color a planar graph using four colors so that no two adjacent vertices receive the same color.

How is the four color theorem used today?

One of the 4 Color Theorem most notable applications is in mobile phone masts. These masts all cover certain areas with some overlap meaning that they can't all transmit on the same frequency. A simple method of ensuring that no two masts that overlap have the same frequency is to give them all a different frequency.