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Helpful theorem, in math NYT Crossword Clue

Across clue · from the October 13, 2025 puzzle

Stuck on “Helpful theorem, in math” from the New York Times Crossword? Here is the verified answer:

Answer
LEMMA
5 letters · Across · last seen October 13, 2025

More clues from the October 13, 2025 puzzle

1A Image floating above the pyramid on a dollar bill 3 1D Suffix with Kafka or Roman 5 2D "___ thank me later!" 5 3D Like Stanford and Harvard 5 4D Cluck of disapproval 3 4A Now 5 5D "Well, looky here!" 3 6D Complete one round of reps 6 7D Poker buy-in 4 8D "That's not news to me" 8 9D Furthermore 3 9A Cook's garment 5