def _v4_isub_ ( s , other ) :
    """Decrement 4-vector with other 4-vector
    >>> p4  = ...
    >>> p4 -= other 
    """
    s.SetE    ( s.E  () - other.E  () )
    s.SetPx   ( s.Px () - other.Px () )
    s.SetPy   ( s.Py () - other.Py () )
    s.SetPz   ( s.Pz () - other.Pz () )
    return s