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feat(MultiTapeTM): loglogn_equals_no_space - #13

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barni120400 wants to merge 2 commits into
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feat/tm-space-gap

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@barni120400 barni120400 commented Sep 12, 2026 •

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Prove SPACE(o(log log n)) = SPACE(1) using input shortening from #12 and the computability API from #39. The proof shows that any halting deterministic machine over a finite alphabet with subloglog space usage already uses constant space, then derives the computability and language results.

@barni120400 barni120400 changed the title feat(MultiTapeTM): subloglog space is constant feat(MultiTapeTM): loglogn_equals_no_space Sep 12, 2026
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barni120400 changed the base branch from feat/tm-input-shortening to main September 21, 2026 16:42
@barni120400 barni120400 reopened this Oct 19, 2026
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barni120400 changed the base branch from main to feat/tm-input-shortening October 19, 2026 14:13
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barni120400 changed the base branch from feat/tm-input-shortening to refactor/multitape-computes-such-that October 19, 2026 20:12
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barni120400 added this pull request to stack #38 October 19, 2026 20:12
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barni120400 force-pushed the feat/tm-space-gap branch 2 times, most recently from 7568a56 to 4016c19 Compare October 19, 2026 21:40
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barni120400 removed this pull request from stack #38 October 21, 2026 08:09
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barni120400 added this pull request to stack #40 October 21, 2026 08:09
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barni120400 removed this pull request from stack #40 October 27, 2026 00:31
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barni120400 added this pull request to stack #45 October 27, 2026 00:32
barni120400 and others added 2 commits November 3, 2026 22:19
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Prove `SPACE(o(log log n)) = SPACE(1)` following Katz's proof idea, with the main
ingredient formalized in `InputShortening.lean`.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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barni120400 removed this pull request from stack #49 November 3, 2026 20:22
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barni120400 changed the base branch from refactor/multitape-computes-such-that to feat/tm-input-shortening November 3, 2026 20:22
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barni120400 added this pull request to stack #57 November 3, 2026 20:22
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