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Ideas for 'Axiomatic Theories of Truth (2005 ver)', 'Grundgesetze der Arithmetik 2 (Basic Laws)' and 'The Boundary Stones of Thought'

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4. Formal Logic / E. Nonclassical Logics / 2. Intuitionist Logic

18799

Intuitionists can accept Double Negation Elimination for decidable propositions [Rumfitt]

18798

It is the second-order part of intuitionistic logic which actually negates some classical theorems [Rumfitt]