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@lean-tom lean-tom commented Jan 1, 2026

Formalized IMO 1971 Problem 6.

  • Used a minimal row/column sum approach.
  • Leveraged matrix transposition to handle symmetry and reuse the auxiliary lemma.


open BigOperators Matrix

snip end
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The snip section should include down through the aux lemma.

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lean-tom commented Jan 1, 2026

Hi @dwrensha,

Done. I've moved the snip end after the aux lemma.
Thank you for the review!

@dwrensha dwrensha merged commit 8103158 into dwrensha:main Jan 2, 2026
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dwrensha commented Jan 2, 2026

Thanks!

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2 participants