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fix: update Chudnovsky problem source link and informal description#133

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kim-em merged 1 commit intomainfrom
fix/chudnovsky-source-link
May 6, 2026
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fix: update Chudnovsky problem source link and informal description#133
kim-em merged 1 commit intomainfrom
fix/chudnovsky-source-link

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@kim-em kim-em commented May 6, 2026

This PR replaces the dead Springer source link
(10.1007/s40316-018-0102-6, 404) on the chudnovsky_formula_for_pi_inv
problem with Milla's arXiv paper https://arxiv.org/abs/1809.00533, which
is also the detailed-proof reference Mathlib cites for chudnovskySum.
It also expands the notes and informal_solution fields to spell out
the actual Chudnovsky formula, so the README is readable without
resolving the chudnovskySum definition in Mathlib.

Reported in DM by Justin Asher.

🤖 Prepared with Claude Code

The previous Springer link (10.1007/s40316-018-0102-6) is dead. Replace
with Milla's arXiv paper (1809.00533), which Mathlib already cites as
the detailed proof reference. Also spell out the formula in the notes
and informal solution so the README is readable without resolving
`chudnovskySum` in Mathlib.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
@kim-em kim-em merged commit d4e22ef into main May 6, 2026
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@kim-em kim-em deleted the fix/chudnovsky-source-link branch May 6, 2026 02:20
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