Moon in a Puddle and the Four-Vertex Theorem

Anton Petrunin, Sergio Zamora Barrera, Ana Cristina Chávez Cáliz

Research output: Contribution to journalComment/debatepeer-review

2 Scopus citations


We present a proof of the Moon in a puddle theorem, and use its key lemma to prove a generalization of the four-vertex theorem.

Original languageEnglish (US)
Pages (from-to)475-479
Number of pages5
JournalAmerican Mathematical Monthly
Issue number5
StatePublished - 2022

All Science Journal Classification (ASJC) codes

  • General Mathematics


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