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hello

please see attached snapshot from the book of Ligthmann & al. (problem book in relativity and gravitation).

Can somebody please explain the expression for the derivative of the solid angle ?

here it is given as dv

How come this is so ?

Thanks,

please see attached snapshot from the book of Ligthmann & al. (problem book in relativity and gravitation).

Can somebody please explain the expression for the derivative of the solid angle ?

here it is given as dv

_{x}dv_{y}where the v's are speeds !!How come this is so ?

Thanks,