Albert Einstein's contributions to mathematics include the theory of relativity, the photoelectric effect, the motion of particles when suspended within a liquid and the mathematical formula E = mc2. E = mc2 is his most famous equation, and it expresses the relationship of energy to mass with "E" as energy, "M" as mass and "C" as the speed of light.
It was Einstein's theory of relativity that gave the world the equation E = mc2. This equation was used with dangerous consequences as one of the key components to the building of the bomb in President Franklin D. Roosevelt's Manhattan Project. This atomic bomb would later be used against Japan to help end World War II. Einstein, however, was not involved in this process as government officials believed that he was a security risk and might compromise the operation.
Einstein's theory of relativity proposed a radical idea that space must be curved around huge objects if it was to account for both time and gravity. This idea was proved in 1919 when astronomers witnessed a solar eclipse and were able to observe Einstein's theory in action.
Einstein also continued to contribute to mathematics by holding teaching positions at universities in Berlin, Zurich and Prague. He also started to contribute to non-mathematical topics, such as peace. He also was one of the signers on a 1939 letter that informed the president that the Germans were capable of creating an atomic bomb.