unilateral surface

unilateral surface

[¦yü·nə′lad·ə·rəl ′sər·fəs]
(mathematics)
A one-sided surface; equivalently, any nonorientable two-dimensional manifold such as the Möbius strip and the Klein bottle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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