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gh-37137: some details in infinity "ring"
some typing annotations, and using the base class `CommutativeRing` ### 📝 Checklist - [x] The title is concise, informative, and self-explanatory. - [x] The description explains in detail what this PR is about. URL: #37137 Reported by: Frédéric Chapoton Reviewer(s): Frédéric Chapoton, Travis Scrimshaw
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