Frequently Used Theorems

To familiarize ourselves with equational proofs in logical graphs let’s run though the proofs of a few basic theorems in the primary algebra.

C₁.  Double Negation Theorem

The first theorem goes under the names of Consequence 1 (C₁), the double negation theorem (DNT), or Reflection.

The proof that follows is adapted from the one George Spencer Brown gave in his book Laws of Form and credited to two of his students, John Dawes and D.A. Utting.

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