# A Theory of Sets by Morse Anthony P. By Morse Anthony P.

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Our theory of notation and subsequent mathematical definitions will make possible a unique interpretation of the two parades just mentioned as well as a host of others. 34 AGREEMENT. A is of power n if and only if A is a nexus in which some symbol of type n appears and no symbol of type less than n appears. For example, are of power 6. 35 D E F I N I T I O N A L SCHEMA. We accept as a definition each expression which can be obtained by replacing ' A ' by an expression of odd power in any one of the expressions: '((X A X' A X " ) SZ ( ( X A X ' ) A X " ) ) ', ' ( ( X A X ' A X " A X m ) E ( ( X h X ' A X " ) AXm))', etc.

13 RULE. introductor. 14 RULE. A formula is fundamental if and only if it is either a simple prefix or an expression of the kind (Act) where A is a simple prefix and ct is the initial symbol of A . 15 RULE. I f F is a strict formula devoid of schemators, and A is a form obtained from F by replacing variables by schematic expressions, then: F is a simple formula, every variable which appears in A also appears in F, a is free in F if and only if ci is free in A , and A can be obtained from F by replacing variables which do not appear in A by schematic expressions.

T o ‘ ( ’ is assigned the value 1 ; to each symbol which is not a parenthesis is assigned the value 0; to ‘ ) ’ is assigned the value - 1. Now if S is any framed expression, then : S is parenthetical if and only if the total value of S is 0 and that of each initial segment is non-negative. Among the parenthetical expressions are: ‘xyz’, ‘x(y -+ x ) ( a --+ b ) t = 2, ‘ ( x -+ ( y -+ 2))’. We agree that c i s j x e d by D if and only if D is a definition that can be obtained from ‘ ( x = y) ’ by replacing ‘y ’ by a parenthetical expression in which c does not occur and ‘ x ’ by a formative expression in which c does occur.