English

## Did you know?

### Four color theorem

Four color theorem was introduced by Francis Guthrie when he tried coloring the map of England. Later, Guthrie speculated the theorem to DeMorgan and it was first printed in 1878 with reference of Cayley.

The basic rule of the theorem is no more than four colors are required to color the regions of the map in such a way that any adjacent region should not share same color. Two regions are called adjacent if they share a common boundary. But same color can be applied when two regions meet at a single point. This theorem concerned with the concept that any map in the plane can be colored by using any four colors.

Initially many Mathematicians was against this theorem. One of the great Mathematician Herman Minkowski, told that the 4-Color Conjecture had not been settled because only third-rate mathematicians had concerned themselves with it. "I believe I can prove it," he declared. After a long period, he admitted, "Heaven is angered by my arrogance; my proof is also defective."

Despite of all this criticism, this Four color theorem was first proved and published by Kenneth Appel and Wolfgang Haken in 1976. This was the major proof of the theorem using computer, because coloring a map manually became more tedious and complicated. Many mathematicians have accepted the theorem to be true.

This theorem is proved and used in many familiar maps that we see today.

#### Latest Facts

##### Paradox of even and natural numbers

We would often think that there are more number of natural numbers than the even numbers because nat...

##### Math madness 0 by 0 equals to 1 by 2

If this is proved to be correct, everything we have learned in our life so far in Mathematics will g...

##### Benfords law (first-digit law)

This will be one of the world most unexplained phenomena you would ever see. The miracle of numbers ...

#### Related Facts

##### Microwave oven by percy spencer

Percy Spencer, an American Engineer accidentally discovered Microwave Oven while working on Raytheon...

##### Maximum possible chess moves is 10921506 possible position after 7 moves

The number of possibility chess moves after the white move's is 20 (ie 4 knight moves and 16 moves o...

##### John nash - a beautiful mind

A Beautiful Mind is the movie based on the life of john nash, who is said to be Nobel Laureate in e...

##### Time dilation: your twin sibling will get more youthful than you

Your twin sibling will get more youthful than you when he returns from the space travel. If your twi...

##### Grigori yakovlevich perelman a mathematician to solve most difficult problems in topology

Grigori Yakovlevich Perelman is a Russian mathematician, who made a history in Riemannian geometry a...

Daily Maths Topic Today - four color theorem.