Ciro Santilli @cirosantilli 37

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PROMYS Europe 2024 problem set / Set 2 / P13 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P12 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P11 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P10 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P9 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P8 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P7 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P6 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P5 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P4 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P3 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P2 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / P1 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / Q2 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe 2024 problem set / Set 2 / Q1 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

Section "Greatest common divisor".

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gmp/antihydra.c by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

Also posted at:

wiki.bbchallenge.org/w/index.php?title=Antihydra&oldid=958 But obviously it got deleted, not even a tiny shitpage maintained by 5 people is immune to deletionism
cstheory.stackexchange.com/questions/20978/what-is-the-smallest-turing-machine-where-it-is-unknown-if-it-halts-or-not/53326#53326
cs.stackexchange.com/questions/59344/what-are-very-short-programs-with-unknown-halting-status/162108#162108

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Antihydra GMP implementation by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

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PROMYS Europe application problem set answers by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

www.reddit.com/r/math/comments/17y9zj3/how_do_i_tackle_problems_from_the_promysross/

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PROMYS Europe 2024 problem set / Set 2 by

Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

Ciro Santilli got his hands on this one. But he was unable to obtain the others. Solving them here would also pose a serious DMCA risk, so perhaps it's just not worth it.

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Ciro Santilli 37 Created 2024-07-12 Updated 2025-07-16

The Antihydra is the first hard-looking problem for BB(6), what some would classify as a Collatz-like problem.

It is documented on the Busy Beaver Challenge wiki at: wiki.bbchallenge.org/wiki/Antihydra

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