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what does the .<...> notation mean?

asked 2020-10-20 05:04:17 +0200

cybervigilante gravatar image

updated 2020-10-20 14:57:51 +0200

slelievre gravatar image

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.

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Sébastien gravatar imageSébastien ( 2020-10-20 17:08:10 +0200 )edit

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answered 2020-10-20 06:21:20 +0200

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.

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Asked: 2020-10-20 05:04:17 +0200

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Last updated: Oct 20 '20