def __init__(self,R,matrix_class):
RingHomomorphism_coercion.__init__(self, R.base_ring().Hom(R), check=False)
self._matrix_class = matrix_class
def __init__(self,A,B):
RingHomomorphism_coercion.__init__(self, A.Hom(B), check=False)
def __init__(self,R,polynomial_class):
RingHomomorphism_coercion.__init__(self, R.base_ring().Hom(R), check=False)
self._polynomial_class = polynomial_class
