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feat: Eq.ndrec lemma #385

Merged
merged 5 commits into from
Jan 15, 2024
Merged

feat: Eq.ndrec lemma #385

merged 5 commits into from
Jan 15, 2024

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fgdorais
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Not sure about the name nor where to put this but it is definitely handy to get rid of ▸:

example (h : n = m) (x : Fin n) : (Eq.ndrec x h).val = x.val := congr_ndrec ..

@fgdorais fgdorais added the awaiting-review This PR is ready for review; the author thinks it is ready to be merged. label Nov 23, 2023
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fgdorais commented Nov 23, 2023 •
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Hm. It doesn't pass the simp test because the lhs head symbol is a variable. Still, it sometimes works and it objectively simplifies when it does. Is this worth an exception?

I guess a more sophisticated ▸ elimination tactic that would apply this (and other) lemmas when appropriate would be better than simp here.

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digama0 commented Nov 25, 2023

Hm. It doesn't pass the simp test because the lhs head symbol is a variable. Still, it sometimes works and it objectively simplifies when it does. Is this worth an exception?

The reason these are disallowed is not because it doesn't work, but because it's a performance issue - they cannot be meaningfully indexed so they apply literally everywhere. I think there should not be an exception made here since it is a rarely used lemma.

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Should this be an auto-generated congruence lemma for simp to use?

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fgdorais commented Dec 7, 2023

Interesting idea. How would that work?

@fgdorais fgdorais changed the title feat: Eq.ndrec simp lemma feat: Eq.ndrec lemma Dec 20, 2023
@joehendrix joehendrix added will-merge-soon PR will be merged soon. Any concerns should be raised quickly. and removed awaiting-review This PR is ready for review; the author thinks it is ready to be merged. labels Jan 10, 2024
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I don't have any recent experience with dependent congruence elimination, but this seems reasonable to me.

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fgdorais commented Jan 10, 2024 •
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This lemma could actually be superseded by #465. I'm not sure though. Eq has special support that I don't fully understand.

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False alarm, it's not quite covered by #465.

@joehendrix joehendrix merged commit 01d1cae into leanprover-community:main Jan 15, 2024
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digama0 pushed a commit that referenced this pull request Jan 17, 2024
@semorrison @kmill
@madvorak @fgdorais @joehendrix
chore: updates to DiscrTree for changes in nightly (#536)
6c1f06a 
* doc: extend docstrings for `ext` and `ext1` (#525)

Makes sure to mention that the patterns are processed using `rintro`, and makes sure `ext` mentions `ext1`.

* docs(Data/List): typo (#529)

* feat: Eq.rec lemma (#385)

* chore: Add empty collection instance to BinomialHeap (#532)

* Incremental Library Search (#421)

This ports library_search from Mathlib to Std.  It preserves the ability to do caching, but is designed to support a cacheless mode.  The exact and apply tactics are named `std_exact?` and `std_apply?`, but will eventually be renamed.

Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

* fix termination_by clauses in LazyDiscrTree

fix LibrarySearch

* bump toolchain

---------

Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Martin Dvořák <martin.dvorak@matfyz.cz>
Co-authored-by: François G. Dorais <fgdorais@gmail.com>
Co-authored-by: Joe Hendrix <joe@lean-fro.org>
semorrison added a commit that referenced this pull request Feb 1, 2024
@semorrison @digama0
@leodemoura @nomeata @kmill @madvorak @fgdorais @joehendrix
chore: move to v4.6.0-rc1, merging adaptations (#576)
276953b 
* feat: hover info for `rcases h : ...` (#486)

* feat: hover info for `rcases h : ...`

* fix

* chore: adaptations for leanprover/lean4#3123 (#502)

* chore: adaptations for leanprover/lean4#3123

* update toolchain

* chore: remove unnecessary `have` (#516)

After leanprover/lean4#3132 the linter will complain about this.

* chore: simproc PR changes (#496)

See leanprover/lean4#3124

Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

* chore: adaptions for nightly-2023-01-11 (#524)

* advance toolchain to nightly-2024-01-12, no updates required

* chore: updates to DiscrTree for changes in nightly (#536)

* doc: extend docstrings for `ext` and `ext1` (#525)

Makes sure to mention that the patterns are processed using `rintro`, and makes sure `ext` mentions `ext1`.

* docs(Data/List): typo (#529)

* feat: Eq.rec lemma (#385)

* chore: Add empty collection instance to BinomialHeap (#532)

* Incremental Library Search (#421)

This ports library_search from Mathlib to Std.  It preserves the ability to do caching, but is designed to support a cacheless mode.  The exact and apply tactics are named `std_exact?` and `std_apply?`, but will eventually be renamed.

Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

* fix termination_by clauses in LazyDiscrTree

fix LibrarySearch

* bump toolchain

---------

Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Martin Dvořák <martin.dvorak@matfyz.cz>
Co-authored-by: François G. Dorais <fgdorais@gmail.com>
Co-authored-by: Joe Hendrix <joe@lean-fro.org>

* feat: adaptations for leanprover/lean4#3159 (#557)

* merge origin/main

* chore: fixes for `simp` refactor (#571)

* move to v4.6.0-rc1

* fix proofs

---------

Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: Leonardo de Moura <leonardo@microsoft.com>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Martin Dvořák <martin.dvorak@matfyz.cz>
Co-authored-by: François G. Dorais <fgdorais@gmail.com>
Co-authored-by: Joe Hendrix <joe@lean-fro.org>
fgdorais added a commit to fgdorais/batteries that referenced this pull request Feb 18, 2024
@fgdorais
feat: Eq.rec lemma (leanprover-community#385)
67be2f2
fgdorais added a commit to fgdorais/batteries that referenced this pull request Feb 18, 2024
@semorrison @digama0
@leodemoura @nomeata @kmill @madvorak @fgdorais @joehendrix
chore: move to v4.6.0-rc1, merging adaptations (leanprover-community#576
e8eb209 
)

* feat: hover info for `rcases h : ...` (leanprover-community#486)

* feat: hover info for `rcases h : ...`

* fix

* chore: adaptations for leanprover/lean4#3123 (leanprover-community#502)

* chore: adaptations for leanprover/lean4#3123

* update toolchain

* chore: remove unnecessary `have` (leanprover-community#516)

After leanprover/lean4#3132 the linter will complain about this.

* chore: simproc PR changes (leanprover-community#496)

See leanprover/lean4#3124

Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

* chore: adaptions for nightly-2023-01-11 (leanprover-community#524)

* advance toolchain to nightly-2024-01-12, no updates required

* chore: updates to DiscrTree for changes in nightly (leanprover-community#536)

* doc: extend docstrings for `ext` and `ext1` (leanprover-community#525)

Makes sure to mention that the patterns are processed using `rintro`, and makes sure `ext` mentions `ext1`.

* docs(Data/List): typo (leanprover-community#529)

* feat: Eq.rec lemma (leanprover-community#385)

* chore: Add empty collection instance to BinomialHeap (leanprover-community#532)

* Incremental Library Search (leanprover-community#421)

This ports library_search from Mathlib to Std.  It preserves the ability to do caching, but is designed to support a cacheless mode.  The exact and apply tactics are named `std_exact?` and `std_apply?`, but will eventually be renamed.

Co-authored-by: Scott Morrison <scott.morrison@gmail.com>

* fix termination_by clauses in LazyDiscrTree

fix LibrarySearch

* bump toolchain

---------

Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Martin Dvořák <martin.dvorak@matfyz.cz>
Co-authored-by: François G. Dorais <fgdorais@gmail.com>
Co-authored-by: Joe Hendrix <joe@lean-fro.org>

* feat: adaptations for leanprover/lean4#3159 (leanprover-community#557)

* merge origin/main

* chore: fixes for `simp` refactor (leanprover-community#571)

* move to v4.6.0-rc1

* fix proofs

---------

Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: Leonardo de Moura <leonardo@microsoft.com>
Co-authored-by: Joachim Breitner <mail@joachim-breitner.de>
Co-authored-by: Kyle Miller <kmill31415@gmail.com>
Co-authored-by: Martin Dvořák <martin.dvorak@matfyz.cz>
Co-authored-by: François G. Dorais <fgdorais@gmail.com>
Co-authored-by: Joe Hendrix <joe@lean-fro.org>
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