How does Einstein's Theory of Relatvitity refer to mass?

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All evidence seems to indicate that the gravitational and inertial masses of a body are equal, as demanded by Einstein's equivalence principle of relativity ; so that at the same location equal (inertial) masses have equal weights… Einstein mass-energy relation, E = mc2 , where E is the energy, and m and c are the (relativistic) mass and the speed of light, respectively. Because of this equivalence of mass and energy , the law of conservation of energy was extended to include mass as a form of energy.