Principles of the Algerbra of Logic

Cover Principles of the Algerbra of Logic
Principles of the Algerbra of Logic
Alexander Macfarlan
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The latter examples differ from the former in that the equivalence asserted does not involve identity.
Observation. — The equation xy^x+y—i is an equation of Condition ; whereas the equation xy=x+y'-i+{i'-x)(i''y) is an Identity. _ 204. Jfxy=m, then xy=m; but not conversely.
For xy=m expresses the identity of the IPs which are x and^ with those which are m. Hence the arithmetical value of xy must be equal to that of m ; that is, xy=m.
But suppose it is given that xys=m.
Digiti ized by Google of
... the form xy^nt. ( Hypothetical.) 83 Since xy may in general have the quantitative value m in a pliurality of ways, and xy^m is only one of these ways ; it does not follow that xy^m.
Cor. If xy^x^ then xy=x.
For xy can have the quantitative value x in only one way; and xy=sx is one way.
205. Hhere are ctriain forms of the eqtuition xy^m, which can be satisfied only by one or both of the symbols having a singular value.
First example ; :cy = i — ;c.
Then xy+x=iy .•. xy=Of (Art. 136) for i is single.


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