Conductor
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Conductor can mean different things in different contexts:
- In science and engineering, a conductor is material which contains movable electric charges in which an electric current can be produced. See also heat conduction.
- In music, a conductor is a person who directs the rehearsals and performances of an orchestra or ensemble; see conducting, and list of conductors.
- A conductor is also a person who sells and checks tickets on a bus, tram or train.
- In pseudorandomness, a conductor is a combinatoral object that extracts randomness from weak random sources. It is a generalization of the concept of an extractor.
- In algebraic number theory, the conductor of an abelian extension is an ideal, modulo which the associated characters are defined.