One can rewrite this equation in differential form to be solved simultaneously with Eqs. (6.7) and (6.8), dab/dr = 4nr2 nb/\/1 - 2Gm/(rc2), (6.15)
with the natural boundary condition ab(0) = 0. In view of baryon-number conservation, ab can be treated as a Lagrangian coordinate in the star; it specifies the position of a matter element during spherically-symmetric evolution of the star (radial accretion, pulsations, collapse, etc.). The total baryon number of the star is rR
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