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[Merged by Bors] - feat(algebra/big_operators): split products and sums over fin (a+b) #13291

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[Merged by Bors] - feat(algebra/big_operators): split products and sums over fin (a+b) #13291

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This PR adds a lemma prod_split which decomposes products and sums over fin (a+b), and a lemma prod_trunc/sum_trunc which shows that a sum over fin n when n=a+b equals the sum of the first a elements when the b last terms vanish.

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@joelriou joelriou added the awaiting-review The author would like community review of the PR label Apr 10, 2022
@joelriou joelriou added maybe-later and removed awaiting-review The author would like community review of the PR labels Apr 10, 2022
@joelriou joelriou added awaiting-review The author would like community review of the PR and removed maybe-later labels Apr 18, 2022
jcommelin
jcommelin reviewed Apr 21, 2022
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bors d+

src/algebra/big_operators/basic.lean Outdated Show resolved Hide resolved
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bors bot commented Apr 21, 2022

✌️ joelriou can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

@leanprover-community-bot-assistant leanprover-community-bot-assistant added delegated The PR author may merge after reviewing final suggestions. and removed awaiting-review The author would like community review of the PR labels Apr 21, 2022
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Co-authored-by: Johan Commelin <johan@commelin.net>
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bors r+

bors bot pushed a commit that referenced this pull request Apr 21, 2022
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feat(algebra/big_operators): split products and sums over fin (a+b) (#…
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…13291)




Co-authored-by: Joël Riou <37772949+joelriou@users.noreply.github.com>
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bors bot commented Apr 22, 2022

Pull request successfully merged into master.

Build succeeded:

@bors bors bot changed the title feat(algebra/big_operators): split products and sums over fin (a+b) [Merged by Bors] - feat(algebra/big_operators): split products and sums over fin (a+b) Apr 22, 2022
@bors bors bot closed this Apr 22, 2022
@bors bors bot deleted the prod_split branch April 22, 2022 01:33
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