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The First Lecture on Non-classical Logics
The Teaching of Mathematics, IV (2001) no. 1, p. 35 .

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The implication fragment of Heyting's logic is the minimal logical system for which deduction theorem holds. This is known, but not emphasized enough. In this note we present an elementary proof of this fact and propose how to use it in order to promote the concept of many-valued logics in a natural way, by giving a concept for the first lecture on this subject.
Classification : 00A35
Keywords: Non-classical logics, deduction relation, deduction theorem, Heyting's logic. 
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Alexandros Pefku. The First Lecture on Non-classical Logics. The Teaching of Mathematics, IV (2001) no. 1, p. 35 . http://geodesic.mathdoc.fr/item/TM2_2001_IV_1_a1/