Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 20
e now beenarranged into m-classes according to the table A B C D E F G (V) B C D E F G A D E F G A B C in which the columns denote m-classes. The reader may note at oncethat this table is, except for the substitution of letters for digits,entirely equivalent to Table (1); indeed (1) is obtained… … § 2] CATEGORICALNESS 5 the m-classes TA and BFG would have an element in common. Thiselement cannot be B, for then ABTD would belong to the samem-class ; it cannot be F, for then AFTE would all belong to the samem-class; and it cannot be G, for then AGTC would all belong to thesame m-class. These…
Geometry, Projective
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