I know it's easy to create a infinite polynomial ring:
R.<y>=InfinitePolynomialRing(ZZ)
But how can I make a infinite polynomial ring with variables indexed by pairs, like x_(a,b)?
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I know it's easy to create a infinite polynomial ring:
R.<y>=InfinitePolynomialRing(ZZ)
But how can I make a infinite polynomial ring with variables indexed by pairs, like x_(a,b)?
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