def __init__(self, precision):
Parent.__init__(self)
self._precision = precision
self.register_coercion(MorphismToSPN(ZZ, self, self._precision))
self.register_coercion(MorphismToSPN(QQ, self, self._precision))
to_SR = Hom(self, SR, Sets())(lambda x: SR(x.sage()))
SR.register_coercion(to_SR)
