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Stable diffeomorphism - Mark Powell

Stable diffeomorphism Mark Powell (Durham University) Manifolds and K-theory: the legacy of Andrew Ranicki online workshop 21 - 25 Jun 2021 The subtitles/captions on this talk are being edited. They…

From  GILLIAN KERR on July 9th, 2021 0 likes 7 plays 0  

CL - 18 - rules

This is a raw video from 2019. I've not yet had time to edit it into chunks. If you have any questions, or find any errors, please let me know on Piazza.This lecture introduces a very important…

From  Haoran Peng on November 30th, 2020 0 likes 205 plays 0  

CL - Implication

We derive the implication rule using the rules introduced last week.

From  Haoran Peng on October 20th, 2020 0 likes 378 plays 0  

CL - Lecture 4.i - Reduction 1

We use the rules to reduce a sequent to a conjunction of simpler sequents. In this example we find that the expression asserted by the sequent is a tautology — it is equivalent to the empty…

From  Claudia-Elena Chirita on October 15th, 2020 0 likes 387 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 find…

From  Claudia-Elena Chirita on October 15th, 2020 0 likes 341 plays 0  

CL - Lecture 4.f - Sequents 1

We interpret additional predicates before the turnstile. These simply express validity in a sub-universe. This means that for any sound rule the corresponding rule with additional predicates is…

From  Claudia-Elena Chirita on October 15th, 2020 0 likes 417 plays 0  

CL - Lecture 4.e - Sequents 0

The following videos introduce sequents, a far-reaching generalisation of the idea underlying Aristotle's propositions. We have already discussed the introduction of multiple antecedents…

From  Claudia-Elena Chirita on October 15th, 2020 0 likes 389 plays 0