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ZELLWEGER, SHEA
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Sign-creation and man-sign engineering.
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Published online by Cambridge University Press: 03 November 2016
Boolean class algebra is a special case of lattice theory and it is well known that the propositional calculus is Boolean. It is also well known that there are sixteen and only sixteen truth functionally distinct relationships between two elementary propositions in the pronositional calculus.
page 119 note * The arrows are reverse-wise to the direction of lattice inclusion, but (as will be seen) they are in the direction of formal implication.