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Line Congruences in Three Dimensions
Author(s) -
Roth L.
Publication year - 1931
Publication title -
proceedings of the london mathematical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.899
H-Index - 65
eISSN - 1460-244X
pISSN - 0024-6115
DOI - 10.1112/plms/s2-32.1.558-s
Subject(s) - pinch , congruence relation , mathematics , line (geometry) , geometry , surface (topology) , combinatorics , pure mathematics , physics , nuclear physics
In my paper (pp. 72–86 of Vol. 32) the following alterations should be made:— P. 80. Formula (9) should read c 2: = −α$ j $ c . P. 81. Delete formula (16). There are no pinch‐points or close‐points on the focal surface, nor are there pinch‐planes or close‐planes.