I was reading about Basic Rings, and the notation
ratpoly.<t> = PolynomialRing(QQ)
popped up. What is the <> for? It's not a function call, although I can see what it does. And the ratpoly has no meaning. I substituted skunkpoly with the same result. I can't seem to find much about it.
As you probably know, Sage is built on top of Python, but then it extends Python's syntax. If you're not sure what some non-Python thing does, use the preparse command:
sage: preparse("ratpoly.<t> = PolynomialRing(QQ)")
"ratpoly = PolynomialRing(QQ, names=('t',)); (t,) = ratpoly._first_ngens(1)"So ratpoly.<t> = PolynomialRing(QQ) creates a polynomial ring with coefficients in the rationals (QQ). The ring itself is called ratpoly, and the generator is called t.
Asked: 4 years ago
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Last updated: Oct 20 '20
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See also https://ask.sagemath.org/question/50560/