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5 votes
2 answers
307 views

Type Theory Lean 3 to Lean 4

1 vote
1 answer
294 views

How to write this non-constructive proof in Lean?

2 votes
1 answer
97 views

Lean: what does the syntax `variable [ring R]` mean?

2 votes
0 answers
28 views

Proving (((finset.range 50).erase 0).erase 1).sum id = (finset.range 50).sum id - 1

1 vote
2 answers
184 views

How to parse Lean 3(?) theorem statements to JSON AST

0 votes
0 answers
177 views

Porting Lean 3 to Lean 4 Process (and the state of general integration in Lean 4)

0 votes
2 answers
110 views

Differential Topology and Differential Geometry Porting to Mathlib4

2 votes
1 answer
97 views

Recursive definition of a sum of squares

2 votes
1 answer
134 views

Vectors in Lean

2 votes
1 answer
137 views

Equality of two functions

1 vote
2 answers
953 views

Make ChatGPT write formal proof from natural language proof

0 votes
1 answer
109 views

A chain of coercion in Lean fails to infer the correct type automatically but each separate step does

2 votes
3 answers
412 views

How can I use a dummy variable to prove a lemma in Lean3?

3 votes
1 answer
70 views

Are there squeeze-versions of ring and abel?

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