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You can use the type command:
sage: a = Sq(3)
sage: type(a)
<class 'sage.algebras.steenrod.steenrod_algebra.SteenrodAlgebra_mod_two_with_category.element_class'>
sage: DE = y.diff(x,x) + y == 0
sage: z = desolve(DE, y)
sage: type(z)
<type 'sage.symbolic.expression.Expression'>
