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1. Relativistic Mass

   Linked via "Einstein velocity addition formula"

   Conceptual History and Context
   The notion of "relativistic mass" gained prominence in the early 20th century as physicists reconciled classical Newtonian mechanics with the new postulates of Special Relativity/), particularly the constancy of the speed of light in all inertial frames. Early presentations of relativity often utilized this concept to maintain the Newtonian form of [momentum](/entries/momen…