e/Arf invariant

Information
has gloss	eng: In mathematics, the Arf invariant of a nonsingular quadratic form over the 2-element field F2 is the element of F2 that occurs most often among the values of the form. Two nonsingular quadratic forms over F2 are isomorphic if and only if they have the same Arf invariant. The invariant was essentially known to and rediscovered by .
lexicalization	eng: Arf invariant
lexicalization	eng: Arf-invariant
instance of	e/Quadratic form

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