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Yup, it's pretty great! although I've not really used tactics in any other prover so I don't really know how they compare! I also how you can mix and match tactic-style and term-style proofs in a pretty seamless way - it seems pretty nice!

8:23 AM · May 29, 2021Twitter Web App

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and

To be completely fair, Isabelle's simp is still strictly more powerful, especially the support for custom simpprocs. I believe that any dependently-typed language that can achieve automation at the level of Isabelle will be a game changer!