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Notes:
In some ways the environment of present-day star forming regions is much more complex. Today, stars form in cold (T~20K) molecular clouds characterized by large turbulent velocity fields with magnetic fields strong enough to provide some gravitational support. The simplicity of the early universe is due in part to the linearity of the initial density perturbations and lack of jets, stellar winds, and supernova shock waves.
The number of stars at a given initial mass is given by the Salpeter law above. One solar mass is the characteristic mass scale, i.e. the most mass goes into stars with mass at this value.