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Fill in the Definition 7.1.1 examples in 7.1 - #720
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Use sum_of_empty, sum_of_nonempty, and Finset.sum_singleton for the five illustrative sums. Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
The elaborated show caused a whnf heartbeat timeout in CI; peel with two rws instead. Co-authored-by: Cursor <cursoragent@cursor.com>
Direct rw on sum_of_nonempty cannot unify m+2 with n+1. Co-authored-by: Cursor <cursoragent@cursor.com>
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Quick follow-up on the five illustrative sums right after Definition 7.1.1 — they’re just instantiations of
sum_of_empty,sum_of_nonempty, andFinset.sum_singleton, so I wired those in instead of leavingsorry.Didn't run a full
lake buildlocally (toolchain download is slow here); CI should tell us if anything's off.Made with Cursor