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## Main Question or Discussion Point

Although I thought that I understand special relativity enough, I cannot now clearly answer on the following question:

What is the most direct derivation, why momentum in special relativity is ##p=\gamma m v##, where ##v## is velocity of the rocket? Let us assume that Lorentz equations are known, so it is not necessary to derive them. Is the postulate of conservation of momentum enough here?

What is the most direct derivation, why momentum in special relativity is ##p=\gamma m v##, where ##v## is velocity of the rocket? Let us assume that Lorentz equations are known, so it is not necessary to derive them. Is the postulate of conservation of momentum enough here?