Permutability of proofs in intuitionistic sequent calculi
We prove a folklore theorem, that two derivations in a cut-free sequent calculus for intuitionistic propositional logic (based on Kleene's {\bf G3}) are inter-permutable (using a set of basic "permutation reduction rules'' derived from Kleene's work in 1952) iff they determi...
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| Format: | article |
| Language: | eng |
| Published: |
1999
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| Online Access: | http://hdl.handle.net/1822/3832 |
| Country: | Portugal |
| Oai: | oai:repositorium.sdum.uminho.pt:1822/3832 |