no its not a theory, because E stands for energy in the object, m is mass, and c is speed of light which is 186,000 miles per second. Its finding how much energy is in an object, and it was created for the atomic bomb. So if it was solved then i don't think it is theory because it was proven to be a real equation.
Improved answer: It is more of a law than a theory. It describes the phenomenon of energy and mass being equal and it cannot be refuted, but it doesn't explain why. However, the equation was not created for the atomic bomb. This equation was written long before the atom was weaponized. There is nothing to solve because it is a framework as it is seen now (E=mc2)
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Mass-energy equivalence
In 1905, where it was published in Einstein's theory of relativity.
Formulated by Albert Einstein and published in his Special Theory of Relativity in 1905.
Albert Einstein introduced the "Matter Energy Equivalent" a part of "[General]Theory of Relativity" on September 27th 1905; it was from this work that the famous E=MC2 is taken.
No. E=mc2 is a formula. Energy equals mass times the speed of light squared.