Quote: use x=1 for proposition X is true; x=0 for falsehood; xy=1 for proposition X and Y are true together; etc.

Quotation

The equation x=1 must be understood to express that the proposition X is true; the equation x=0, that the proposition X is false. The equation xy=1 will express that the propositions are both true together; and the equation xy=0 that they are not both together true. In like manner the equations x(1-y)+y(1-x)=1, x(1-y)+y(1-x)=0, will respectively assert the truth and the falsehood of the disjunctive Proposition, "Either X is true or Y is true."   Google-1   Google-2

Published before 1923

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