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### Prerequisites
* [x] Put an X between the brackets on this line if you have done all of the following:
* Checked that your issue isn't already [filed](https://github.com/leanprover/lean4/is…
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I don't know what this part means as I don't know lean 3, but why is lean 3 supported?
I thought Lean 3 had been deprecated.
```yml
- name: Install lean-language-server if Lean 3
shell…
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### Proposal
`simp` should not define tactic-defined `let`s (maybe these are called `fvar`s) by default, or at least the option to do so should be one character, as opposed to having to use `(confi…
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This definition
```
def test : ∀ i j : Nat, Nat
| 0, _ => 1
| _, 0 => 1
| i + 1, j + 1 => test i (j + 1) + test (i + 1) j
```
needs
```
termination_by _ i j => (i, j)
```
or
```
ter…
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When `pp.beta` is set to `true`, the pretty-printer (delaborator) should apply beta reduction.
Lean 3 implements this feature, but we had *not* implemented it yet in Lean 4.
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**Description**
What happened?
按照官网教程，安装了leandojo ， 在测试的时候，报错如下信息。请帮忙看看。
做过以下尝试：Extracting Data from Lean 4 ， 也是相同问题。
---------------------------------------------------------t.py 内容------------…
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### Discussed in https://github.com/lean-dojo/LeanDojo/discussions/116
Originally posted by **Moyvbai** December 29, 2023
I used LeanDojo to trace lean4 project(repo = LeanGitRepo(
"https…
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**Project description**
[Lean](https://leanprover.github.io/) is a functional programming language and interactive theorem prover. Currently Nixpkgs provides the older versions, [Lean](https://git…
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We're gradually phasing out mathlib and switching to mathlib4.
I'm going to remove the link to the changelog website from the sidebar of https://leanprover-community.github.io/, but of course it wi…
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### Prerequisites
* [x] Put an X between the brackets on this line if you have done all of the following:
* Checked that your issue isn't already [filed](https://github.com/leanprover/lean4/is…