In this virtual logic column we discuss the transfinite ordinal numbers of Georg Cantor (Cantor, 1895/1941) and show how they are related to the expressions in the calculus of indications of George Spencer-Brown in his remarkable book Laws of Form (Spencer-Brown, 1969) and to infinite expressions and reentry forms as well. Cantor is the originator of the theory of sets. He said that a set is a multiplicity that can be seen as a unity. This dictum applies even to the empty set { } where there are zero elements in the multiplicity, and yet that nothing is drawn into a unity and becomes the one empty set. The dictum applies to a finity such as 3 where the set {{},{{}},{{},{{}}}} draws three distinct sets into a new set with three distinct members and so becomes one. The dictum applies to an infinity such as {1,2,3,...} where the set braces draw together all positive integers into a unity that can represent the one concept of positive integrality. The dictum applies to a self reference such as "I am the one who says I." where the act of saying articulates the self-relation of a self to itself, making a distinction and joining that distinction in the very act of apparent separation, and so coming to one.
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