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title | date | summary |
---|---|---|
norm_cast was upstreamed to Lean4 | 2024-02-21 | I am now a contributor to Lean! |
In 2019, I was an intern at Matryoshka
in Amsterdam. There, I worked with Robert Y. Lewis
on a tactic for the Lean prover called norm_cast
. The goal was to reduce the
frustration of mathematicians when working with expressions containing casts and
coercions. This work was merged into Mathlib and even led to the writing of a
paper.
Well, after a brief transit in Lean's standard library, the tactic was merged yesterday into the core language!