Changes

where <math>c^2</math> is square of speed of light in vacuum adjusted by <math>(d\tau/dt)</math> (ratio of proper time to coordinate time<ref>

where <math>c^2</math> is square of speed of light in vacuum adjusted by <math>(d\tau/dt)</math> (ratio of proper time to coordinate time<ref>

This ratio is expressed sometimes as  

This ratio is expressed usually as  

:<math>d\tau/dt=\sqrt{-g_{oo}}</math>,  

:<math>d\tau/dt=\sqrt{-g_{oo}}</math>,  

where <math>(-g_{oo})</math> is time-time component of metric of spacetime, which means that <math>mc^2 \sqrt{-g_{oo}}</math> is not a constant but a function of time and we may take its non vanishing derivative with respect to time to calculate gravitational force.

where <math>(-g_{oo})</math> is time-time component of metric of spacetime, which means that <math>mc^2 \sqrt{-g_{oo}}</math> is not a constant but a function of time and we may take its non vanishing derivative with respect to time to calculate gravitational force.