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Kaluza-Klein theory is a classical theory that unifies gravity and electromagnetism by showing that general relativity in 5-dimensions reduces to the equations of 4-dimensional general relativity and the Maxwell equations in 4 dimensions.

theory is a classical theory that unifies gravity () and electromagnetism (). Kaluza - Klein theory shows that in 5 dimensions is equivalent to plus in 4-dimensions.

is an extension of which also unifies the weak force and the strong force, and with .

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