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factor() is defined for polynomials.

None results from using simplify() function with polynomials. It is a function, which works with symbolic expressions not polynomials. Besides, there is nothing to "simplify" in polynomials or fraction fields over them.

You can switch to symbolic expression and then use simplify() (although it seems pointless):

print(simplify(SR(r2)))

factor() is defined for polynomials.

None results from using simplify() function with on fraction of polynomials. It is a function, which works with symbolic expressions not polynomials. polynomials or their fractions. Besides, there is nothing to "simplify" in polynomials or fraction fields over them.

You can switch to symbolic expression and then use simplify() (although it seems pointless):

print(simplify(SR(r2)))

factor() is defined for polynomials.

None results from using simplify() function on fraction of polynomials. It is a function, which works with symbolic expressions not polynomials or their fractions. Besides, there is nothing to "simplify" in polynomials or fraction fields over them.their fractions (the latter is always stored in reduced form).

You Said that,, you can switch to symbolic expression and then use enforce using simplify() (although by first converting its argument to symbolic expression, although it seems pointless):pointless:

print(simplify(SR(r2)))