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 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 nforum 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 topicSubobject Philosophy
- Category nLab General Discussions
- Started by Keith J. Bauer
- Comments 1
- Last comment by Keith J. Bauer
- Last Active 5 days ago

- Discussion Type
- discussion topicQuery at HowTo on downloading the nLab
- Category nLab General Discussions
- Started by Andrew Stacey
- Comments 28
- Last comment by Quantaurix
- Last Active Apr 25th 2024

- Discussion Type
- discussion topicSpam and crackpots in nCafe
- Category nLab General Discussions
- Started by RodMcGuire
- Comments 75
- Last comment by ʇɐ
- Last Active Apr 20th 2024

- Discussion Type
- discussion topicdark theme
- Category nLab General Discussions
- Started by PaoloPerrone
- Comments 15
- Last comment by Urs
- Last Active Mar 31st 2024

- Discussion Type
- discussion topicRemove crypto-crap?
- Category nLab General Discussions
- Started by ncfavier
- Comments 3
- Last comment by zskoda
- Last Active Mar 10th 2024

- Discussion Type
- discussion topic2-equivariant elliptic cohomology
- Category nLab General Discussions
- Started by Zhen Huan
- Comments 5
- Last comment by Urs
- Last Active Mar 9th 2024

- Discussion Type
- discussion topicmotivation pages
- Category nLab General Discussions
- Started by PaoloPerrone
- Comments 3
- Last comment by perezl.alonso
- Last Active Jan 26th 2024

- Discussion Type
- discussion topicsigned graphs
- Category nLab General Discussions
- Started by Zaslav
- Comments 1
- Last comment by Zaslav
- Last Active Jan 14th 2024

- Discussion Type
- discussion topicThe `simplex category' page
- Category nLab General Discussions
- Started by Barber
- Comments 2
- Last comment by Dmitri Pavlov
- Last Active Dec 26th 2023

- Discussion Type
- discussion topicduplicate: category of partial equivalence relations
- Category nLab General Discussions
- Started by ncfavier
- Comments 2
- Last comment by ncfavier
- Last Active Dec 7th 2023

- Discussion Type
- discussion topicGödel's second incompleteness theorem
- Category nLab General Discussions
- Started by Richard Williamson
- Comments 16
- Last comment by SridharRamesh
- Last Active Nov 18th 2023

- Discussion Type
- discussion topiccategory theory events
- Category nLab General Discussions
- Started by John Baez
- Comments 6
- Last comment by Urs
- Last Active Oct 17th 2023

- Discussion Type
- discussion topicGeometric version of Red-shift conjecture
- Category nLab General Discussions
- Started by Zhen Huan
- Comments 3
- Last comment by Zhen Huan
- Last Active Sep 8th 2023

- Discussion Type
- discussion topicUnification of the four forces in the Spin(11,1) geometric algebra
- Category nLab General Discussions
- Started by rks987
- Comments 1
- Last comment by rks987
- Last Active Feb 7th 2023

- Discussion Type
- discussion topicHigher Algebra
- Category nLab General Discussions
- Started by ATCurious
- Comments 1
- Last comment by ATCurious
- Last Active Jan 14th 2023

- Discussion Type
- discussion topicgeneralisation as an adjunction
- Category nLab General Discussions
- Started by AndriusKulikauskas
- Comments 1
- Last comment by AndriusKulikauskas
- Last Active Jan 12th 2023

- Discussion Type
- discussion topicTransgression and Transgression of Bundle gerbe
- Category nLab General Discussions
- Started by Zhen Huan
- Comments 3
- Last comment by Zhen Huan
- Last Active Dec 12th 2022

- Discussion Type
- discussion topicSetoids, Bishop sets, and symmetric preorders on the nLab
- Category nLab General Discussions
- Started by Madeleine Birchfield
- Comments 12
- Last comment by Mike Shulman
- Last Active Sep 26th 2022

- Discussion Type
- discussion topicThe default definition of category on the nLab
- Category nLab General Discussions
- Started by Madeleine Birchfield
- Comments 9
- Last comment by Mike Shulman
- Last Active Aug 30th 2022

- Discussion Type
- discussion topicThank you
- Category nLab General Discussions
- Started by tjayaraman
- Comments 2
- Last comment by DavidRoberts
- Last Active Aug 27th 2022

- Discussion Type
- discussion topicRenaming the nLab
- Category nLab General Discussions
- Started by Madeleine Birchfield
- Comments 2
- Last comment by J-B Vienney
- Last Active Jul 25th 2022

- Discussion Type
- discussion topicFormal definition of Functor without support of set theory
- Category nLab General Discussions
- Started by LucasBorboleta
- Comments 4
- Last comment by LucasBorboleta
- Last Active May 31st 2022

- Discussion Type
- discussion topicnLab presentation at *Big Data in Pure Math 2022*
- Category nLab General Discussions
- Started by Urs
- Comments 6
- Last comment by DavidRoberts
- Last Active May 25th 2022

- Discussion Type
- discussion topicCap Product
- Category nLab General Discussions
- Started by HDB
- Comments 2
- Last comment by Dmitri Pavlov
- Last Active Apr 17th 2022

- Discussion Type
- discussion topicDefinitions of constructive fields
- Category nLab General Discussions
- Started by EgbertRijke
- Comments 3
- Last comment by IngoBlechschmidt
- Last Active Apr 12th 2022

- Discussion Type
- discussion topicBenton's notion of linear category
- Category nLab General Discussions
- Started by metaweta
- Comments 2
- Last comment by Todd_Trimble
- Last Active Jan 27th 2022

- Discussion Type
- discussion topicCiting yourself
- Category nLab General Discussions
- Started by anuyts
- Comments 3
- Last comment by David_Corfield
- Last Active Jan 22nd 2022

- Discussion Type
- discussion topicA homotopy cofiber sequence in "Intro to stable homotopy theory"
- Category nLab General Discussions
- Started by Bruno Stonek
- Comments 9
- Last comment by Bruno Stonek
- Last Active Dec 2nd 2021

- Discussion Type
- discussion topic[deleted]
- Category nLab General Discussions
- Started by DELETED_USER_2018
- Comments 37
- Last comment by DELETED_USER_2018
- Last Active Oct 7th 2021

- Discussion Type
- discussion topicCatabase: a database of categories
- Category nLab General Discussions
- Started by Corbin
- Comments 6
- Last comment by Urs
- Last Active Oct 7th 2021

- Discussion Type
- discussion topicApplication of Karoubian envelope in constructions in K-theory
- Category nLab General Discussions
- Started by IngoD
- Comments 1
- Last comment by IngoD
- Last Active Sep 10th 2021

- Discussion Type
- discussion topic'Wheel' theory
- Category nLab General Discussions
- Started by DavidRoberts
- Comments 4
- Last comment by DavidRoberts
- Last Active Aug 25th 2021

- Discussion Type
- discussion topicDiagram of Examples of Categories
- Category nLab General Discussions
- Started by Leopold
- Comments 2
- Last comment by Urs
- Last Active Aug 25th 2021

- Discussion Type
- discussion topic[deleted]
- Category nLab General Discussions
- Started by DELETED_USER_2018
- Comments 2
- Last comment by Todd_Trimble
- Last Active Jul 11th 2021

- Discussion Type
- discussion topic[deleted]
- Category nLab General Discussions
- Started by DELETED_USER_2018
- Comments 4
- Last comment by DELETED_USER_2018
- Last Active Jul 7th 2021

- Discussion Type
- discussion topicvector addition in Vect Category
- Category nLab General Discussions
- Started by ml
- Comments 9
- Last comment by Todd_Trimble
- Last Active Feb 24th 2021

- Discussion Type
- discussion topicDensity and continuity vs base and linearity
- Category nLab General Discussions
- Started by ml
- Comments 6
- Last comment by ml
- Last Active Jan 24th 2021

- Discussion Type
- discussion topicGrothendieck
- Category nLab General Discussions
- Started by carmonamateogm
- Comments 1
- Last comment by carmonamateogm
- Last Active Jan 13th 2021

- Discussion Type
- discussion topicLast year's activity on the nLab!
- Category nLab General Discussions
- Started by Richard Williamson
- Comments 8
- Last comment by Hurkyl
- Last Active Jan 5th 2021

- Discussion Type
- discussion topicTetracategory and Unit Conditions
- Category nLab General Discussions
- Started by Tapo
- Comments 7
- Last comment by Tapo
- Last Active Dec 31st 2020

- Discussion Type
- discussion topicInternal logic of a groupoid
- Category nLab General Discussions
- Started by Ericson2314
- Comments 1
- Last comment by Ericson2314
- Last Active Dec 18th 2020

- Discussion Type
- discussion topicWhy would a geometer care about predicative mathematics?
- Category nLab General Discussions
- Started by Dmitri Pavlov
- Comments 24
- Last comment by DavidRoberts
- Last Active Dec 6th 2020

- Discussion Type
- discussion topicJoyal's CatLab
- Category nLab General Discussions
- Started by Todd_Trimble
- Comments 51
- Last comment by Dmitri Pavlov
- Last Active Nov 20th 2020

- Discussion Type
- discussion topicsemistrictification of equivalences
- Category nLab General Discussions
- Started by Richard Williamson
- Comments 5
- Last comment by Mike Shulman
- Last Active Jul 7th 2020

- Discussion Type
- discussion topicLocally internal stacks as categories of families?
- Category nLab General Discussions
- Started by DavidRoberts
- Comments 5
- Last comment by zskoda
- Last Active Jun 17th 2020

- Discussion Type
- discussion topiclocalization of a commutative ring
- Category nLab General Discussions
- Started by Urs
- Comments 7
- Last comment by zskoda
- Last Active Jun 17th 2020

- Discussion Type
- discussion topic[deleted]
- Category nLab General Discussions
- Started by DELETED_USER_2018
- Comments 1
- Last comment by DELETED_USER_2018
- Last Active Jun 16th 2020

- Discussion Type
- discussion topicSmith space
- Category nLab General Discussions
- Started by David_Corfield
- Comments 1
- Last comment by David_Corfield
- Last Active Jun 16th 2020

- Discussion Type
- discussion topicsheaves versus ∞-sheaves on the cartesian site
- Category nLab General Discussions
- Started by Dmitri Pavlov
- Comments 1
- Last comment by Dmitri Pavlov
- Last Active Feb 26th 2020

- Discussion Type
- discussion topictensor hierarchy
- Category nLab General Discussions
- Started by jim_stasheff
- Comments 1
- Last comment by jim_stasheff
- Last Active Feb 12th 2020

- Discussion Type
- discussion topicWhat is the relationship between BG as classifying space and *//G the classifying stack/topos?
- Category nLab General Discussions
- Started by ziggurism
- Comments 12
- Last comment by ziggurism
- Last Active Feb 6th 2020

- Discussion Type
- discussion topicUnderstanding the definition of lax natural transformation
- Category nLab General Discussions
- Started by heades
- Comments 3
- Last comment by heades
- Last Active Jan 17th 2020

- Discussion Type
- discussion topicMorphisms of bicategories
- Category nLab General Discussions
- Started by Keith Harbaugh
- Comments 5
- Last comment by Mike Shulman
- Last Active Jan 15th 2020

- Discussion Type
- discussion topicDatabases,RDF,Queries and Cats
- Category nLab General Discussions
- Started by bblfish
- Comments 1
- Last comment by bblfish
- Last Active Sep 5th 2019

- Discussion Type
- discussion topicFormula Search
- Category nLab General Discussions
- Started by spitters
- Comments 4
- Last comment by spitters
- Last Active Aug 7th 2019

- Discussion Type
- discussion topicProblem with embedded parentheses in HTML link for a DOI
- Category nLab General Discussions
- Started by Keith Harbaugh
- Comments 3
- Last comment by Richard Williamson
- Last Active Aug 2nd 2019

- Discussion Type
- discussion topicApplied Category Theory on the nLab
- Category nLab General Discussions
- Started by julesh
- Comments 12
- Last comment by Urs
- Last Active Jul 18th 2019

- Discussion Type
- discussion topicStabilizer group
- Category nLab General Discussions
- Started by jesuslop
- Comments 6
- Last comment by Richard Williamson
- Last Active Jun 16th 2019

- Discussion Type
- discussion topicSome recent and coming changes for the nLab
- Category nLab General Discussions
- Started by DavidRoberts
- Comments 42
- Last comment by Richard Williamson
- Last Active Apr 27th 2019

- Discussion Type
- discussion topicDuplicate pages on hyperkähler manifolds
- Category nLab General Discussions
- Started by Maxence Mayrand
- Comments 2
- Last comment by Urs
- Last Active Apr 12th 2019