Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective topology Not able to be oriented.

Etymologies

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Examples

  • The Pn, that is the real projective spaces, have a remarkable property: for even dimensions n they are nonorientable, but for odd dimensions orientable.

    INFINITY SALOMON BOCHNER 1968

  • A space is orientable, if a tornado (or any other spinning top), when moving along any closed path, returns to its starting point with the same sense of gyration with which it started, and it is nonorientable if along some closed path the sense of gyration is reversed.

    INFINITY SALOMON BOCHNER 1968

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