A short note on lattices allowing disjunctive reasoning.
Enric Trillas, Eloy Renedo, Claudi Alsina (2006)
Mathware and Soft Computing
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This short note shows that the scheme of disjunctive reasoning, , not , does not hold neither in proper ortholattices nor in proper de Morgan algebras. In both cases the scheme, once translated into the inequality , forces the structure to be a boolean algebra.