cuspidal edge
Regression Re*gres"sion (r?*gr?sh"?n), n. [L. regressio: cf. F. r['e]gression.] The act of passing back or returning; retrogression; retrogradation. --Sir T. Browne. [1913 Webster]

{Edge of regression} (of a surface) (Geom.), the line along which a surface turns back upon itself; -- called also a {cuspidal edge}.

{Regression point} (Geom.), a cusp. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Edge of regression — Regression Re*gres sion (r?*gr?sh ?n), n. [L. regressio: cf. F. r[ e]gression.] The act of passing back or returning; retrogression; retrogradation. Sir T. Browne. [1913 Webster] {Edge of regression} (of a surface) (Geom.), the line along which a …   The Collaborative International Dictionary of English

  • Pseudosphere — In geometry, a pseudosphere of radius R is a surface of curvature −1/ R 2 (precisely, a complete, simply connected surface of that curvature), by analogy with the sphere of radius R , which is a surface of curvature 1/ R 2. The term was… …   Wikipedia

  • Regression — Re*gres sion (r?*gr?sh ?n), n. [L. regressio: cf. F. r[ e]gression.] The act of passing back or returning; retrogression; retrogradation. Sir T. Browne. [1913 Webster] {Edge of regression} (of a surface) (Geom.), the line along which a surface… …   The Collaborative International Dictionary of English

  • Regression point — Regression Re*gres sion (r?*gr?sh ?n), n. [L. regressio: cf. F. r[ e]gression.] The act of passing back or returning; retrogression; retrogradation. Sir T. Browne. [1913 Webster] {Edge of regression} (of a surface) (Geom.), the line along which a …   The Collaborative International Dictionary of English

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