This interpretation is a concrete representation of our assumptions. Every proposition derived from the assumptions must be true of this system of triples. Hence none of the assumptions can be logically inconsistent with the rest; otherwise contradictory... Projective Geometry - Page 3by Oswald Veblen, John Wesley Young - 1910Full view
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OSWALD VEBLEN - 1910
...the digits 0,1, 2, 3, 4, 5, 6 and the w-classes to mean the columns in the following table: 0123456 (1) 1234560 3456012 This interpretation is a concrete...containing both these elements (Assumptions I, II). The m-class containing the elements A and B may conveniently be denoted by the symbol AB. Any two m-classes...