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### Motivation
The simplifier is not very helpful when giving a non-terminating simp set:
```lean
variable (P : Nat → Prop)
/--
error: tactic 'simp' failed, nested error:
maximum recursion d…
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**地震学参考书的目标：**
介绍地震学基础。
**内容：**
1. 震源：理论和正演算法
2. 地震波：理论和正演算法
3. 地球内部结构
4. 地震仪器: 整理、翻译、重排地震仪器基础
- New Manual of Seismological Observatory Practice：第 4、5、6、7、10 等章
- Instrumentatio…
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Modal logics have been around a long time, indeed, as long as logic (as its own field) has existed. There are a number of them, including linear temporal logic (which FL and Mario at least started fo…
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Hello,
In the peano examples. Is it normal that term al
has type wff () in mmu :
` (term al ((x nat) (ph wff (x))) (wff ()))`
and type wff (x) in mm0 :
`term al {x: nat} (p: wff x): wff;`
…
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Please list here things that you were not able to find good documentation for. This will let us prioritize what needs to be fixed/updated.
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## There are a bunch of errors in Isabelle, the majority of which were mirrored from Lean
### Here a list of theorems possibly containing errors:
It is worth looking into for each language.
I c…
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A bookdown chapter with the lone content below triggers the error below that. It requires the div be named "solution" and there to be a button inside (this is created by a function from the webex pack…
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2 June 2022
- WOCE Atlas: http://sam.ucsd.edu/whp_atlas/atlantic/sections.htm
- Physical Oceanography Textbook: https://www.sciencedirect.com/book/9780750645522/descriptive-physical-oceanography
- …
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```
>>> integrate(x*exp(x)**x)
exp(x**2)/2
```
See the discussion at https://github.com/sympy/sympy/pull/13225#issuecomment-328142341. `exp(x)**x` is not the same as `exp(x**2)`, but the Risch a…
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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
* …