olymmath

Putnam 2024 B2

  • Session B

Two convex quadrilaterals are called partners if they have three vertices in common and they can be labeled ABCDABCD and ABCEABCE so that EE is the reflection of DD across the perpendicular bisector of the diagonal AC‾\overline{AC}. Is there an infinite sequence of convex quadrilaterals such that each quadrilateral is a partner of its successor and no two elements of the sequence are congruent? [A diagram has been omitted.]

Curated text Kedlaya Putnam archive. Quoted with source.

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