The story
Named after August Ferdinand Möbius (1790–1868), a German mathematician and theoretical astronomer who introduced it in 1832.
Etymology from Wiktionary, CC BY-SA 4.0.
Möbius function
Today it means: A function from the natural numbers to the set {−1, 0, 1} which maps perfect squares to 0, prime numbers to −1, and is multiplicative. Full definition →