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authorDavid A. Madore <david+git@madore.org>2023-12-09 11:37:43 +0100
committerDavid A. Madore <david+git@madore.org>2023-12-09 11:37:43 +0100
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Fix a mistake: contraction rule cannot be dispensed with.
(See discussion in example 3.1.3 in Troelstra & Schwichtenberg: the system I presented is essentially their G2i, and the contraction rule is necessary.)
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