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BOOK VI.. The Method of Subscripts.

Symbolic Logic · Lewis Carroll — chapter 40 of 49 · ~141 words · public domain

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THE METHOD OF SUBSCRIPTS.

CHAPTER I.

INTRODUCTORY.

Let us agree that "x{1}" shall mean "Some existing Things have the Attribute x", i.e. (more briefly) "Some x exist"; also that "xy{1}" shall mean "Some xy exist", and so on. Such a Proposition may be called an '=Entity=.'

Also that "x{0}" shall mean "No existing Things have the Attribute x", i.e. (more briefly) "No x exist"; also that "xy{0}" shall mean "No xy exist", and so on. Such a Proposition may be called a '=Nullity='.

Also that "+" shall mean "and".

Also that "¶" shall mean "would, if true, prove".

When two Letters are both of them accented, or both not accented, they are said to have '=Like Signs=', or to be '=Like=': when one is accented, and the other not, they are said to have '=Unlike Signs=', or to be '=Unlike='.

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