I see, thanks both of you!
@Waldek
What's wrong in trying to "honestly" convert eg Expression(Integer) to a
Polynomial(Expression(Integer)) or a Fraction (Polynomial(Expression(Integer)))?
1) -> Expression(Integer) has Ring
(1) true
Type: Boolean
(2) -> Expression(Integer) has Field
(2) true
Type: Boolean
(3) -> Expression(Integer) has PolynomialFactorizationExplicit
(3) true
Type: Boolean
(4) -> exi:=%pi+%e^2
2
(4) %e + %pi
Type: Expression(Integer)
(5) -> exi::Polynomial(Expression(Integer))
Polynomial(Expression(Integer)) is not a valid type.
(5) ->
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