Galileo Galile wrote "the Theory of Relativity", and Einstein wrote the General theory of relativity and the special theory of relativity.
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The theory of relativity was introduced by Albert Einstein in 1905 with his special theory of relativity, and later expanded with the general theory of relativity in 1915.
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Einstein's theory of relativity encompasses two theories:
special relativity and general relativity.
The theory of relativity is simply referred to as relativity in
the field of physics.
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Albert Einstein proposed the theory of relativity in 1905 with his special theory of relativity and in 1915 with his general theory of relativity.