# Search for tag: "counterexample"

#### CL - 9a - Recap

This video is a brief recap of most of the logic we have covered so far. You may find it useful, to jog your memory and check your understanding.

From  Haoran Peng 0 likes 362 plays 0

#### 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 0 likes 25 plays 0

#### CL - Sequents

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

From  Haoran Peng 0 likes 344 plays 0

#### CL - Lecture 4.j - Reduction 2

We use the rules to reduce a sequent to a conjunction of simple sequents, sequents that only mentions propositional letters, with no connectives, and no repetitions — in this example, we…

From  Claudia-Elena Chirita 0 likes 353 plays 0

#### CL - Lecture 3d - Using Venn Diagrams to show a Syllogism is Sound

Given a syllogistic rule, how do we show that it is sound? Here we show that using Venn diagrams.

From  Haoran Peng 0 likes 475 plays 0