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Full Idea
Many-valued logics do not have reasonable natural deduction systems.
Gist of Idea
Many-valued logics lack a natural deduction system
Source
Edwin D. Mares (Negation [2014], 1)
Book Ref
'Bloomsbury Companion to Philosophical Logic', ed/tr. Horsten,L/Pettigrew,R [Bloomsbury 2014], p.182