# Gelfand

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**Gelfand** is a surname meaning "[elephant](/source/Elephant)" in the [Yiddish language](/source/Yiddish_language), and may refer to:

## People

- [Alan Gelfand](/source/Alan_Gelfand), inventor of the ollie, a skateboarding move
- [Alan E. Gelfand](/source/Alan_E._Gelfand), statistician
- [Boris Gelfand](/source/Boris_Gelfand), chess grandmaster
- [Israel Gelfand](/source/Israel_Gelfand), mathematician
- [Israel Lazarevich Gelfand](/source/Alexander_Parvus), Russian-born SPD agent
- [Mikhail Gelfand](/source/Mikhail_Gelfand), molecular biologist and bioinformacist, grandson of Israel (mathematician)
- [Vladimir Gelfand](/source/Vladimir_Gelfand), Soviet-Jewish writer

## Notions in mathematics

Named after [Israel Gelfand](/source/Israel_Gelfand):

- the [Gelfand representation](/source/Gelfand_representation) allows a complete characterization of commutative C*-algebras as algebras of continuous complex-valued functions
- the [Gelfand–Naimark–Segal construction](/source/Gelfand%E2%80%93Naimark%E2%80%93Segal_construction)
- the [Gelfand–Naimark theorem](/source/Gelfand%E2%80%93Naimark_theorem)
- the [Gelfand–Mazur theorem](/source/Gelfand%E2%80%93Mazur_theorem)
- a [Gelfand pair](/source/Gelfand_pair), a pair (*G*,*K*) consisting of a locally compact unimodular group *G* and a compact subgroup *K*
- a [Gelfand triple](/source/Gelfand_triple), a construction designed to link the distribution (test function) and square-integrable aspects of functional analysis

## See also

- [Gelfond](/source/Gelfond)
- [Helfand](/source/Helfand)
- [Helfant](/source/Helfant)

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