feat: sorted decreasing lists are well founded #6361
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The main result now has a 30-line proof at https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/List.2ELex.20is.20well.20founded.20on.20decreasing.20lists/near/382708025 |
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…6432) shorter proof of the main result of #6361 Zulip: https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/List.2ELex.20is.20well.20founded.20on.20decreasing.20lists/near/382708025 Co-authored-by: Junyan Xu <junyanxu.math@gmail.com>
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…6432) shorter proof of the main result of #6361 Zulip: https://leanprover.zulipchat.com/#narrow/stream/217875-Is-there-code-for-X.3F/topic/List.2ELex.20is.20well.20founded.20on.20decreasing.20lists/near/382708025 Co-authored-by: Junyan Xu <junyanxu.math@gmail.com>
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Closing as it has been made redundant by #6432. 🎉 |
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Co-authored-by: Scott Morrison scott@tqft.net @semorrison
We prove that the lexicographic ordering on the type of decreasing lists in a well founded linear order is well founded, and related results.