Questions tagged [isar]
Use this tag for the ISAR (Intelligible semi-automated reasoning) proof language in the Isabelle proof assistant.
5
questions
2
votes
1
answer
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Picking this and calculation in Isabelle/JEdit output
This is a follow-up to
How to write a low-level proof in Isar?
Having
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1
vote
1
answer
46
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8
votes
1
answer
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Is there an elegant way of proving an equality A=B by going in both directions?
I would like to prove an equality by splitting it into a proof in each direction.
Is there a more elegant style to start such a proof than this way::
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19
votes
2
answers
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Why is Isabelle usually not just Isabelle but Isabelle/<xyz>?
For most proof assistants the name alone is common, E.g. Coq, Lean but with Isabelle it is often seen as Isabelle/<xyz>?
Why the two parts?
What is
Isabelle/HOL
Isabelle/FOL
Isabelle/ZF
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7
votes
1
answer
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Is there a way to use sledgehammer in Isar proofs?
I tried to use the sledgehammer command in Isabelle/HOL (2021) after the proof command, and got an error:
Illegal application ...
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