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I'd like to add some verified interfaces (VectorSpace and related) and also unverified versions of the existing ones (`Group`, `Ring`, `Field`, ...) as unverified versions would also be usable with ty…
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# Matroids, briefly · Ben Zhang
Over the summer, I casually got back into competitive programming. I was really surprised to see that Matroid Intersection is now a topic that shows up in contest prob…
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The next big urgent change to SASyLF is closer-to-first-class treatment of ":=". Right now inversion and cases can create these, but it would solve a long-standing problem for theorems to be able to …
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We need an even/odd world. A proposal: `IsEven x := \exists t, x = t + t`, `IsOdd x := \exists t, x = t + t + 1`, and then the boss levels of that world is that every natural is either even or odd, an…
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For those who have taken graph theory/are currently taking graph theory, can you recommend resources for learning more of the theory behind it? Or point me to some of the fundamental theorems? Just cu…
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In the example article I have used various directives, e.g. theorem, proposition, etc (see https://mystmd.org/guide/proofs-and-theorems). The directives do not appear in the Latex/Tex file.
Note: …
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CakeML's `miscTheory` and `preamble` contain many general-purpose theorems and tools that are supposed to be upstreamed to HOL wherever possible. This issue is to do an upstreaming pass. To resolve th…
xrchz updated
5 years ago
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Here https://github.com/nikivazou/theorem-proving-template/blob/master/safe-lists/src/Theorems/List.hs#L10
`Data.List.hs` defines `(++)` as an infix reflected function: https://github.com/nikivazou…
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### Prerequisites
Please put an X between the brackets as you perform the following steps:
* [x] Check that your issue is not already filed:
https://github.com/leanprover/lean4/issues
* …
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I propose to (eventually) amend the definitions df-shift and df-substr as follows:
```
${
$d f x y $.
$( Define the translate of a function (or relation) on complex numbers by a
given number. …