Search for tag: "sequent"

CL - 5x - Supplementary on Sequents

This video includes a couple of points from a 2019 review lecture on Sequents.First we discuss how to use reduction to find an inhabited model in which Γ ⊨ Δ, which is equivalent to…

From  Haoran Peng on October 30th, 2020 0 likes 10 plays 0  

CL - Barbara

Gentzen's rules provide a complete system that does not require the cut rule. For many logical systems, cut elimination (showing that uses of the cut rule may be eliminated from any sound proof)…

From  Haoran Peng on October 21st, 2020 0 likes 272 plays 0  

CL - Sequents

We introduce sequents, where we have finite sets of predicates on both sides of the turnstile.

From  Haoran Peng on October 20th, 2020 0 likes 323 plays 0  

CL - Q&A - Thursday Week 4

In week 4 we introduced Gentzen's sequents.You should make sure you understand when a sequent is valid, and what it means to provide a counter-example to a sequent -- a universe in which the…

From  Haoran Peng on October 20th, 2020 0 likes 331 plays 0