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feat(MultiTapeTM): input shortening - #900

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barni120400 wants to merge 25 commits into
leanprover:mainfrom
barni120400:feat/tm-input-shortening
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barni120400 wants to merge 25 commits into
leanprover:mainfrom
barni120400:feat/tm-input-shortening

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@barni120400

@barni120400 barni120400 commented Sep 12, 2026

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Add bounded visit sequences and input shortening for multitape Turing machines. Matching boundary symbols and visit sequences allow an input interval to be deleted while preserving storage reached outside it. The PR also adds DecidableInSpace and supporting counting and asymptotic lemmas.

@barni120400
barni120400 force-pushed the feat/tm-input-shortening branch from 23f79eb to 626903e Compare September 18, 2026 14:59
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