(expr, assumptions)
Real ** Even -> NonNegative
        Real ** Odd  -> same_as_base
        NonNegative ** Positive -> NonNegative
Real ** Even -> NonNegative
        Real ** Odd  -> same_as_base
        NonNegative ** Positive -> NonNegative
Real ** Even - > NonNegative Real ** Odd - > same_as_base NonNegative ** Positive - > NonNegative
def Pow(expr, assumptions):
        """
        Real ** Even -> NonNegative
        Real ** Odd  -> same_as_base
        NonNegative ** Positive -> NonNegative
        """
        if expr.is_number:
            return AskNegativeHandler._number(expr, assumptions)
        if ask(Q.real(expr.base), assumptions):
            if ask(Q.positive(expr.base), assumptions):
                if ask(Q.real(expr.exp), assumptions):
                    return False
            if ask(Q.even(expr.exp), assumptions):
                return False
            if ask(Q.odd(expr.exp), assumptions):
                return ask(Q.negative(expr.base), assumptions)
def Pow ( expr , assumptions ) : if expr . is_number : return AskNegativeHandler . _number ( expr , assumptions ) if ask ( Q . real ( expr . base ) , assumptions ) : if ask ( Q . positive ( expr . base ) , assumptions ) : if ask ( Q . real ( expr . exp ) , assumptions ) : return False if ask ( Q . even ( expr . exp ) , assumptions ) : return False if ask ( Q . odd ( expr . exp ) , assumptions ) : return ask ( Q . negative ( expr . base ) , assumptions )