Not signed in (Sign In)

A discussion forum about contributions to the nLab wiki and related areas of mathematics, physics, and philosophy.

Want to take part in these discussions? Sign in if you have an account, or apply for one below

2-category 2-category-theory abelian-categories adjoint algebra algebraic algebraic-geometry algebraic-topology analysis analytic-geometry arithmetic arithmetic-geometry book bundles calculus categorical categories category category-theory chern-weil-theory cohesion cohesive-homotopy-type-theory cohomology colimits combinatorics complex complex-geometry computable-mathematics computer-science constructive cosmology deformation-theory descent diagrams differential differential-cohomology differential-equations differential-geometry digraphs duality elliptic-cohomology enriched fibration finite foundation foundations functional-analysis functor gauge-theory gebra geometric-quantization geometry graph graphs gravity grothendieck group group-theory harmonic-analysis higher higher-algebra higher-category-theory higher-differential-geometry higher-geometry higher-lie-theory higher-topos-theory homological homological-algebra homotopy homotopy-theory homotopy-type-theory index-theory integration integration-theory k-theory lie-theory limits linear linear-algebra locale localization logic mathematics measure-theory modal modal-logic model model-category-theory monad monads monoidal monoidal-category-theory morphism motives motivic-cohomology nlab noncommutative noncommutative-geometry number-theory of operads operator operator-algebra order-theory pages pasting philosophy physics pro-object probability probability-theory quantization quantum quantum-field quantum-field-theory quantum-mechanics quantum-physics quantum-theory question representation representation-theory riemannian-geometry scheme schemes set set-theory sheaf sheaves simplicial space spin-geometry stable-homotopy-theory stack string string-theory superalgebra supergeometry svg symplectic-geometry synthetic-differential-geometry terminology theory topology topos topos-theory tqft type type-theory universal variational-calculus

Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.

If you want to take part in these discussions either sign in now (if you have an account), apply for one now (if you don't).

- Discussion Type
- discussion topicthe Category of Resource Description Framework (RDF)
- Category - nLab General Discussions
- Started by bblfish
- Comments 3
- Last comment by bblfish
- Last Active May 1st 2016

- Discussion Type
- discussion topicreflective subuniverse
- Category - Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Oct 28th 2014

- Discussion Type
- discussion topicfragment (logic)
- Category - Latest Changes
- Started by Urs
- Comments 15
- Last comment by Noam_Zeilberger
- Last Active Nov 3rd 2014

- Discussion Type
- discussion topicsyntactic category
- Category - nLab General Discussions
- Started by Urs
- Comments 8
- Last comment by Mike Shulman
- Last Active May 7th 2016

- Discussion Type
- discussion topicnecessity and possibility
- Category - Latest Changes
- Started by Urs
- Comments 209
- Last comment by Urs
- Last Active Aug 6th 2023

- Discussion Type
- discussion topicIs one of our definitions of “Cartesian multicategory” incorrect?
- Category nLab
- Started by goblin
- Comments 4
- Last comment by SridharRamesh
- Last Active Feb 25th 2015

- Discussion Type
- discussion topicPrincipia Mathematica
- Category - Latest Changes
- Started by Urs
- Comments 7
- Last comment by Urs
- Last Active Jan 23rd 2023

- Discussion Type
- discussion topicSets for Mathematics
- Category - Latest Changes
- Started by Urs
- Comments 2
- Last comment by Urs
- Last Active Jul 7th 2020

- Discussion Type
- discussion topicLogic as the Essence of Philosophy
- Category - Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Apr 17th 2015

- Discussion Type
- discussion topiccoalgebraic logic
- Category - Latest Changes
- Started by zskoda
- Comments 2
- Last comment by David_Corfield
- Last Active May 19th 2015

- Discussion Type
- discussion topicde dicto and de re
- Category - Latest Changes
- Started by Urs
- Comments 5
- Last comment by David_Corfield
- Last Active Sep 13th 2016

- Discussion Type
- discussion topicSeuren
- Category - Latest Changes
- Started by zskoda
- Comments 1
- Last comment by zskoda
- Last Active May 1st 2016

- Discussion Type
- discussion topicHow to express predicate logic in the categorical (monoidal) logics?
- Category - Mathematics, Physics & Philosophy
- Started by tomr
- Comments 2
- Last comment by Todd_Trimble
- Last Active Oct 31st 2016

- Discussion Type
- discussion topicCan approximation or heurisitc methods overcome undecidability?
- Category - Mathematics, Physics & Philosophy
- Started by tomr
- Comments 1
- Last comment by tomr
- Last Active Nov 2nd 2016

- Discussion Type
- discussion topiccontextual category
- Category - Latest Changes
- Started by Urs
- Comments 5
- Last comment by Mike Shulman
- Last Active Jan 20th 2017

- Discussion Type
- discussion topiclaw of double negation
- Category - Latest Changes
- Started by Urs
- Comments 8
- Last comment by TobyBartels
- Last Active Mar 30th 2017

- Discussion Type
- discussion topicclassical logic
- Category - Latest Changes
- Started by Urs
- Comments 13
- Last comment by Todd_Trimble
- Last Active May 3rd 2017

- Discussion Type
- discussion topicproof by contradiction
- Category - Latest Changes
- Started by Urs
- Comments 15
- Last comment by Todd_Trimble
- Last Active Jul 26th 2018

- Discussion Type
- discussion topicconstructive/intuitionistic
- Category - Mathematics, Physics & Philosophy
- Started by Urs
- Comments 13
- Last comment by spitters
- Last Active May 9th 2017

- Discussion Type
- discussion topicdouble negation
- Category - Latest Changes
- Started by Urs
- Comments 14
- Last comment by Urs
- Last Active Aug 16th 2024

- Discussion Type
- discussion topicA proof that the induction principle holds in a suitable type theory
- Category - nLab General Discussions
- Started by JamesSmith
- Comments 5
- Last comment by JamesSmith
- Last Active May 15th 2017

- Discussion Type
- discussion topicsheaf semantics
- Category - Latest Changes
- Started by Urs
- Comments 2
- Last comment by Mike Shulman
- Last Active May 25th 2017

- Discussion Type
- discussion topicforcing and classifying toposes
- Category - Latest Changes
- Started by Urs
- Comments 9
- Last comment by Mike Shulman
- Last Active Jun 2nd 2017

- Discussion Type
- discussion topicHigher model theory
- Category - Mathematics, Physics & Philosophy
- Started by Peter Heinig
- Comments 4
- Last comment by Urs
- Last Active Jul 12th 2017

- Discussion Type
- discussion topicirreflexive relation
- Category - Latest Changes
- Started by Peter Heinig
- Comments 8
- Last comment by Mike Shulman
- Last Active Aug 1st 2017

- Discussion Type
- discussion topicAdmissible rule
- Category - Latest Changes
- Started by maxsnew
- Comments 6
- Last comment by Mike Shulman
- Last Active Dec 16th 2017

- Discussion Type
- discussion topicsubformula property
- Category - Latest Changes
- Started by maxsnew
- Comments 1
- Last comment by maxsnew
- Last Active Jan 25th 2018

- Discussion Type
- discussion topicLogic with (user defined) (modal) functions that can accept sentences (propositions, formulas) as ar
- Category - Mathematics, Physics & Philosophy
- Started by tomr
- Comments 11
- Last comment by tomr
- Last Active Jun 26th 2018

- Discussion Type
- discussion topicLogic with (user defined) (modal) functions that can accept sentences (propositions, formulas) as ar
- Category - Mathematics, Physics & Philosophy
- Started by tomr
- Comments 11
- Last comment by tomr
- Last Active Jun 26th 2018

- Discussion Type
- discussion topicabstract model theory (institutions), modal logic & contexts
- Category n-Forum
- Started by bblfish
- Comments 10
- Last comment by bblfish
- Last Active Sep 20th 2018