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 galois-theory 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 planar 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 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 topicFreedman & Hastings question
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 9
- Last comment by Urs
- Last Active 14 hours ago

- Discussion Type
- discussion topicConnes on the unconscious
- Category Mathematics, Physics & Philosophy
- Started by David_Corfield
- Comments 6
- Last comment by David_Corfield
- Last Active May 19th 2023

- Discussion Type
- discussion topicDoing reverse mathematics like research in category theory - any references?
- Category Mathematics, Physics & Philosophy
- Started by tomr
- Comments 3
- Last comment by DavidRoberts
- Last Active May 14th 2023

- Discussion Type
- discussion topicalpha-conversion
- Category Preprints & Publications
- Started by George Cherevichenko
- Comments 3
- Last comment by DavidRoberts
- Last Active Apr 26th 2023

- Discussion Type
- discussion topicAlgebraization of Higher Order Logic. Trying to extend Rosetta, alg-geo dualities to HOL.
- Category Mathematics, Physics & Philosophy
- Started by tomr
- Comments 3
- Last comment by tomr
- Last Active Apr 17th 2023

- Discussion Type
- discussion topicMay recognition theorem
- Category Mathematics, Physics & Philosophy
- Started by domenico_fiorenza
- Comments 12
- Last comment by Dmitri Pavlov
- Last Active Mar 26th 2023

- Discussion Type
- discussion topic"Topological Quantum Gates in Homotopy Type Theory"
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 16
- Last comment by DavidRoberts
- Last Active Mar 21st 2023

- Discussion Type
- discussion topicSurvey: Higher Geometric Prequantum Theory
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 20
- Last comment by Urs
- Last Active Feb 22nd 2023

- Discussion Type
- discussion topic(T)QFT on orbifolds?
- Category Mathematics, Physics & Philosophy
- Started by perezl.alonso
- Comments 3
- Last comment by perezl.alonso
- Last Active Feb 10th 2023

- Discussion Type
- discussion topicWhat is denoted by operator bold-B in "Differential cohomology in a cohesive ∞-topos"
- Category Mathematics, Physics & Philosophy
- Started by tomr
- Comments 4
- Last comment by Urs
- Last Active Jan 14th 2023

- Discussion Type
- discussion topicE8 heterotic string from Cartan
- Category Mathematics, Physics & Philosophy
- Started by perezl.alonso
- Comments 2
- Last comment by Urs
- Last Active Dec 5th 2022

- Discussion Type
- discussion topic"Fundamental weight systems are quantum states"
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 8
- Last comment by Urs
- Last Active Nov 16th 2022

- Discussion Type
- discussion topicTopos Theory Books
- Category Mathematics, Physics & Philosophy
- Started by Nonsensei
- Comments 5
- Last comment by Nonsensei
- Last Active Nov 14th 2022

- Discussion Type
- discussion topicRussian Philosophical Conference
- Category Mathematics, Physics & Philosophy
- Started by alexey
- Comments 1
- Last comment by alexey
- Last Active Nov 12th 2022

- Discussion Type
- discussion topicQuantum Computational Trilogy
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 10
- Last comment by David_Corfield
- Last Active Oct 31st 2022

- Discussion Type
- discussion topic"Twisted Cohomotopy implies M-theory anomaly cancellation"
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 154
- Last comment by David_Corfield
- Last Active Oct 18th 2022

- Discussion Type
- discussion topic"infinity-local systems"
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 4
- Last comment by Tim_Porter
- Last Active Sep 20th 2022

- Discussion Type
- discussion topiclocally small category
- Category Mathematics, Physics & Philosophy
- Started by Todd_Trimble
- Comments 34
- Last comment by zskoda
- Last Active Aug 31st 2022

- Discussion Type
- discussion topicunstable K(n)-homotopy theory
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 2
- Last comment by David_Corfield
- Last Active Aug 30th 2022

- Discussion Type
- discussion topic"programmable computations" and type families
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 12
- Last comment by Urs
- Last Active Aug 29th 2022

- Discussion Type
- discussion topicUnderstanding the Infinite I: Niceness, Robustness, and Realism
- Category Preprints & Publications
- Started by J-B Vienney
- Comments 2
- Last comment by David_Corfield
- Last Active Aug 26th 2022

- Discussion Type
- discussion topicType-semantics for quantization
- Category Mathematics, Physics & Philosophy
- Started by David_Corfield
- Comments 112
- Last comment by David_Corfield
- Last Active Aug 23rd 2022

- Discussion Type
- discussion topicCayley mixture
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 118
- Last comment by David_Corfield
- Last Active Aug 11th 2022

- Discussion Type
- discussion topicThe shape of function objects
- Category Mathematics, Physics & Philosophy
- Started by Charles Rezk
- Comments 5
- Last comment by Urs
- Last Active Aug 9th 2022

- Discussion Type
- discussion topicStrings 2022
- Category Mathematics, Physics & Philosophy
- Started by Madeleine Birchfield
- Comments 3
- Last comment by Madeleine Birchfield
- Last Active Jul 20th 2022

- Discussion Type
- discussion topicproof of coend formula for Kan extensions
- Category Mathematics, Physics & Philosophy
- Started by Yaron
- Comments 3
- Last comment by Yaron
- Last Active Jul 9th 2022

- Discussion Type
- discussion topicPlus construction
- Category Mathematics, Physics & Philosophy
- Started by Zhen Huan
- Comments 3
- Last comment by Zhen Huan
- Last Active Jun 30th 2022

- Discussion Type
- discussion topicbibitem conventions
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 3
- Last comment by Urs
- Last Active Jun 26th 2022

- Discussion Type
- discussion topicAnyonic topological order in TED K-theory
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 9
- Last comment by Urs
- Last Active Jun 25th 2022

- Discussion Type
- discussion topicGeneralized cohomology as sheaf cohomology?
- Category Mathematics, Physics & Philosophy
- Started by jin
- Comments 6
- Last comment by Urs
- Last Active Jun 18th 2022

- Discussion Type
- discussion topicUnderstanding preprint "Topos and Stacks of Deep Neural Networks"
- Category Mathematics, Physics & Philosophy
- Started by tomr
- Comments 22
- Last comment by tomr
- Last Active Jun 17th 2022

- Discussion Type
- discussion topicstatistic inference as gauge theory
- Category Mathematics, Physics & Philosophy
- Started by David_Corfield
- Comments 1
- Last comment by David_Corfield
- Last Active Jun 12th 2022

- Discussion Type
- discussion topicTopological K-theory in HoTT?
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jun 9th 2022

- Discussion Type
- discussion topicHegel in Mathematics
- Category Mathematics, Physics & Philosophy
- Started by Alexander Praehauser
- Comments 24
- Last comment by Alexander Praehauser
- Last Active Jun 4th 2022

- Discussion Type
- discussion topicDescent data with values in the bigroupoid of bundle gerbes with connection and curving
- Category Mathematics, Physics & Philosophy
- Started by DavidRoberts
- Comments 5
- Last comment by Urs
- Last Active May 27th 2022

- Discussion Type
- discussion topicPhilosophy of concepts - can it be (gradually) expressed in type theory? Taming the complexity?
- Category Mathematics, Physics & Philosophy
- Started by tomr
- Comments 4
- Last comment by philophronesis
- Last Active May 19th 2022

- Discussion Type
- discussion topicThird generation HOTT talks
- Category Mathematics, Physics & Philosophy
- Started by David_Corfield
- Comments 17
- Last comment by Madeleine Birchfield
- Last Active May 13th 2022

- Discussion Type
- discussion topic2dCFT as 1-twisted homology of configurations of points on a surface -- references
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 8
- Last comment by Urs
- Last Active May 11th 2022

- Discussion Type[Closed]
- discussion topicI am nonbinary
- Category Atrium
- Started by TobyBartels
- Comments 16
- Last comment by TobyBartels
- Last Active Apr 23rd 2022

- Discussion Type
- discussion topicAnyonic Defect Branes in TED-K-Theory
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 6
- Last comment by David_Corfield
- Last Active Mar 17th 2022

- Discussion Type
- discussion topicsplitting of rationalized representation ring
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 2
- Last comment by Urs
- Last Active Jan 30th 2022

- Discussion Type
- discussion topicProspects for unification of LQG and String Theory
- Category Mathematics, Physics & Philosophy
- Started by Spacenumbat
- Comments 8
- Last comment by Urs
- Last Active Jan 18th 2022

- Discussion Type
- discussion topicMusings on modalities
- Category Mathematics, Physics & Philosophy
- Started by David_Corfield
- Comments 8
- Last comment by David_Corfield
- Last Active Jan 11th 2022

- Discussion Type
- discussion topic6 Postdoc positions in topological quantum science at NYU AD
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jan 9th 2022

- Discussion Type
- discussion topicWorking example for SEAR Axiom 5
- Category Mathematics, Physics & Philosophy
- Started by YimingXu
- Comments 14
- Last comment by RodMcGuire
- Last Active Jan 7th 2022

- Discussion Type
- discussion topicHypothesis H and Matrix models
- Category Mathematics, Physics & Philosophy
- Started by Spacenumbat
- Comments 3
- Last comment by Spacenumbat
- Last Active Dec 31st 2021

- Discussion Type
- discussion topicintroduction/elimination as co(units)
- Category Mathematics, Physics & Philosophy
- Started by David_Corfield
- Comments 6
- Last comment by David_Corfield
- Last Active Dec 22nd 2021

- Discussion Type
- discussion topicChern-Simons and Other Topological Field Theories workshop
- Category Mathematics, Physics & Philosophy
- Started by David_Corfield
- Comments 2
- Last comment by David_Corfield
- Last Active Nov 17th 2021

- Discussion Type
- discussion topicThe nLab in the eyes of others
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 54
- Last comment by Urs
- Last Active Oct 5th 2021

- Discussion Type
- discussion topicBasic questions about SEAR and its ETCS fragment
- Category Mathematics, Physics & Philosophy
- Started by saolof
- Comments 3
- Last comment by Mike Shulman
- Last Active Oct 3rd 2021

- Discussion Type
- discussion topicUnification and Anti-Unification in HoTT.
- Category Mathematics, Physics & Philosophy
- Started by Nima
- Comments 3
- Last comment by Nima
- Last Active Sep 28th 2021

- Discussion Type
- discussion topicGeneralized Cohomology and Physics conference
- Category Mathematics, Physics & Philosophy
- Started by David_Corfield
- Comments 6
- Last comment by David_Corfield
- Last Active Sep 26th 2021

- Discussion Type
- discussion topicCategory theory of stochastic differential equations - any pointers?
- Category Mathematics, Physics & Philosophy
- Started by tomr
- Comments 1
- Last comment by tomr
- Last Active Sep 16th 2021

- Discussion Type
- discussion topicHammock Localization
- Category Mathematics, Physics & Philosophy
- Started by mrmuon
- Comments 4
- Last comment by Dmitri Pavlov
- Last Active Sep 13th 2021

- Discussion Type
- discussion topicGrothendieck toposes as bridges
- Category Mathematics, Physics & Philosophy
- Started by Korman
- Comments 8
- Last comment by OliviaCaramello
- Last Active Sep 6th 2021

- Discussion Type
- discussion topiccharacter map on twisted non-abelian cohomology
- Category Mathematics, Physics & Philosophy
- Started by Urs
- Comments 44
- Last comment by Urs
- Last Active Aug 18th 2021

- Discussion Type
- discussion topicPredicates and Equivalences
- Category Mathematics, Physics & Philosophy
- Started by Nima
- Comments 5
- Last comment by Nima
- Last Active Aug 15th 2021

- Discussion Type
- discussion topicDoes "topos and stacks of DNN" is the tool for M-theory as autodidactic (Multi)Universe?
- Category Mathematics, Physics & Philosophy
- Started by tomr
- Comments 3
- Last comment by rongmin
- Last Active Jul 28th 2021

- Discussion Type
- discussion topicCybernetics and Homotopy Theory/Category Theory
- Category Mathematics, Physics & Philosophy
- Started by Jon Beardsley
- Comments 23
- Last comment by AZ_Submariner
- Last Active Jul 10th 2021

- Discussion Type
- discussion topicNontrivial examples of rig categories
- Category Mathematics, Physics & Philosophy
- Started by PaoloPerrone
- Comments 3
- Last comment by PaoloPerrone
- Last Active Jun 21st 2021