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## Main Question or Discussion Point

I have spent some time reading other threads and other source. However I could not find any clear derivation of relativistic mass and momentum

In this case for example

http://www.phys.ufl.edu/~acosta/phy2061/lectures/Relativity4.pdf

On the first page, how come you can give such a new definition of momentum in the moving frame as:

p = dX / dTo

I understand if it would be p = dXo / dTo

Could anyone please recommend/write derivations for relativistic momentum and relativistic mass

In this case for example

http://www.phys.ufl.edu/~acosta/phy2061/lectures/Relativity4.pdf

On the first page, how come you can give such a new definition of momentum in the moving frame as:

p = dX / dTo

I understand if it would be p = dXo / dTo

Could anyone please recommend/write derivations for relativistic momentum and relativistic mass