Belnap's four-valued logic is isomorphic to the cusp catastrophe, making the algebra FOUR the minimal complete structure for continuous-discrete interfaces with involution symmetry and revealing X and Z as topological invariants.
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Bilattice-Catastrophe Isomorphism for Four-Valued Logic in Digital Systems
Belnap's four-valued logic is isomorphic to the cusp catastrophe, making the algebra FOUR the minimal complete structure for continuous-discrete interfaces with involution symmetry and revealing X and Z as topological invariants.