non-orientabilityn.
/ˌnɒnɔːrɪˌɛntəˈbɪlᵻti/, /ˌnɒnɒrɪˌɛntəˈbɪlᵻti/, U.S. /ˈˌnɑnˌɔriˌɛn(t)əˈbɪlᵻdi/ Mathematics.
The property of being non-orientable.
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the world > relative properties > number > geometry > [noun] > geometrical property
duality1532
magnitude1570
solidity1570
order1706
symmetry1823
unicursality1887
self-coincidence1902
closure1905
non-orientability1938
1938 Proc. National Acad. Sci. U.S.A. 24 520 For the case of non-orientability one can easily construct similar normal domains by considering the corresponding orientable double surface.
1964 H. Levy Projective & Related Geometries v. 388 We shall derive two properties of L2 that are strongly suggestive of its nonorientability.
1996 Trans. Amer. Math. Soc. 348 873 The coefficients are counting series in b for hypermaps in locally orientable surfaces with respect to a parameter of nonorientability.
This entry has been updated (OED Third Edition, December 2003; most recently modified version published online March 2022).
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n.1938