Ivan Shishkin, Pine Forest

Weekly Problem Design Contest

Contest open

The two squares

Starts Saturday, September 19, 2026 Deadline Friday, September 25, 2026 · Paris time Prize 100 reputation points

Create a problem on the theme entitled “The Two Squares.”

Your problem must necessarily involve two squares, in the broadest possible sense: geometric squares, squares of numbers, or any other interpretation of the term “square,” such as the square of a matrix, for example.

How entries are judged

  • Fit to the weekly theme
  • Originality : your problem has to be invented for this contest.
  • Mathematical interest
  • Clarity
  • Presentation

Rules

One entry per person. You may edit your problem until Friday at 23:59, Paris time. Admins select one winner and may also award honorable mentions. Translations of the same problem count as one entry.

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Entries

4
9Carrés imbriquésFRAncient Tree18Deux carrés chanceuxFRFiniteField40Polynômes réels positifsFRSequoia48Quand un groupe fini a exactement deux carrésFRÉtienne86

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