from sage.libs.ginac cimport *
from sage.structure.element cimport CommutativeRingElement
cdef class Expression(CommutativeRingElement):
cdef GEx _gobj
cdef Expression coerce_in(self, z)
cpdef object _eval_self(self, R)
cpdef object _convert(self, R)
cpdef bint is_polynomial(self, var)
cpdef bint is_relational(self)
cpdef bint is_infinity(self)
cpdef object pyobject(self)
cpdef Expression _subs_expr(self, expr)
cdef Expression new_Expression_from_GEx(parent, GEx juice)
cdef Expression new_Expression_from_pyobject(parent, x)
