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pfaffian

Today it means: The determinant of a skew-symmetric matrix, capable of being written as the square of a polynomial in the matrix entries. Full definition →

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Pfaffian · noun¹

From Pfaff + -ian, after Johann Friedrich Pfaff.

Pfaffian · noun²

After Charles Ignatious Pfaff, the founder of the restaurant.

Etymology from Wiktionary, CC BY-SA 4.0.