**Mathematics**

- Loop (algebra), a quasigroup with an identity element
- Loop (graph theory), an edge that begins and ends on the same vertex
- Loop (topology), a path that starts and ends at the same point

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### Famous quotes containing the word mathematics:

“In *mathematics* he was greater

Than Tycho Brahe, or Erra Pater:

For he, by geometric scale,

Could take the size of pots of ale;

Resolve, by sines and tangents straight,

If bread and butter wanted weight;

And wisely tell what hour o’ th’ day

The clock doth strike, by algebra.”

—Samuel Butler (1612–1680)

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—Amelia E. Barr (1831–1919)