A Survey of Symbolic Logic

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This method of proving the Distributive Law is taken from Huntington, "Sets of Independent Postulates for the Algebra of Logic ". The proof of the long and difficult lemma 3 is due to Peirce, who worked it out for his paper of 1880 but mislaid the sheets, and it was printed for the first time in Huntington's paper. 6 5-51 (a + b)(c + d) = (a c + b c) + (a d + b d).
[5 5] (a + 6) (c + d) = (a + 6) c + (a + 6) d = (a c + b c) + (a d + b d) .
5-52 a + bc = (a + 6)(a + c). (Correlate of 5 5) [5-51]
... (a + 6) (a + c) = (a a + b a) + (a c + b c) = [(a + a 6) + a c] + &*e.
But [5-4] (a + a 6) + a c = a + a c = a. Hence Q. E. D. Further theorems which are often useful in working the algebra and which follow readily from the preceding are as follows: 6 See "Sets of Independent Postulates, etc. ", loc. C, it. , p. 300, footnote. 10 130 A Survey of Symbolic Logic 5-6 a-1 = a = 1-a.
[1-5] a-0 = 0. Hence a--l = 0. But [1-61] if a--l = 0, then a-1 = a.
5-61 acl.
[1-9] Since a-1 = a, acl. 5-62 a + = a = + a.


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