Proof of Axioms of Propositional Logic IV

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The enclosure containing "A" in A:NA is called a Structure enclosure, the second enclosure is the empty structure connected with an Introductor, introducing negation: thus the negated empty structure.

willemesterhuyse
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The "some relation" in A:AD must match and if it is a "therefore" relation, the direction of the arrow must match.

willemesterhuyse
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Note that the first 3 or 4 screens are the same as video 1, but after that it's different.

willemesterhuyse