“Part of Fermat's copy of "Arithmetica" where he wrote his Last Theorem” crossword clue

Reveal the answer to see why it works and where this clue has appeared before.MARGINS is the answer to the New York Times crossword clue “Part of Fermat's copy of "Arithmetica" where he wrote his Last Theorem”. It was last seen in the puzzle of July 31, 2026, where it runs at 9 Down and fills 7 squares. It crosses 7 other entries in that grid — those are listed below and are the quickest way to confirm the letters you already have.