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- Discussion Type
- discussion topicfunction application
- Category Latest Changes
- Started by Mike Shulman
- Comments 10
- Last comment by Todd_Trimble
- Last Active Aug 16th 2012

I created function application, so as to be able to link to it from fixed-point combinator. While adding links, I was motivated to expand a bit on function.

- Discussion Type
- discussion topicdual object in a closed monoidal category
- Category Latest Changes
- Started by Todd_Trimble
- Comments 16
- Last comment by TobyBartels
- Last Active Aug 14th 2012

- Discussion Type
- discussion topicZ_infinity-modules
- Category Latest Changes
- Started by Zhen Lin
- Comments 4
- Last comment by Urs
- Last Active Aug 13th 2012

I started the article Z-infinity-module. Hopefully someone here can say something more interesting about them!

- Discussion Type
- discussion topicadjoint equivalence
- Category Latest Changes
- Started by Mike Shulman
- Comments 6
- Last comment by Mike Shulman
- Last Active Aug 13th 2012

I added some remarks to adjoint equivalence about improving equivalences to adjoint ones, with links to&from equivalence and equivalence in a quasicategory.

- Discussion Type
- discussion topicRiesz representation theorems
- Category Latest Changes
- Started by TobyBartels
- Comments 2
- Last comment by Urs
- Last Active Aug 12th 2012

I'm putting all the big duality theorems from measure theory at Riesz representation theorem. Only a couple are filled in so far, but I'm out of time for today.

- Discussion Type
- discussion topicSpam and other types of 'interference'
- Category Latest Changes
- Started by Tim_Porter
- Comments 8
- Last comment by Tim_Porter
- Last Active Aug 8th 2012

There have been several entries with no math content recently. What is the procedure? I am meaning: Search results for definion and The Enemy of my Enemy is not my Friend.

- Discussion Type
- discussion topicProblems with all pages on dependent type theory
- Category Latest Changes
- Started by Harry Gindi
- Comments 10
- Last comment by Mike Shulman
- Last Active Aug 7th 2012

Heya. I haven’t actually made the necessary changes, but the various pages on dependent type theory make the statement that every DTT or MLTT is the internal logic of an LCCC and every LCCC is the categorical semantics of some DTT/MLTT. However, this is extremely confusing (it took me 2 or 3 hours to find a page where it was made completely clear), since it makes explicit use of super-strong extensionality (I think this is called beta-translation), that is to say, it is a theorem about extensional DTTs/MLTTs.

It’s not even totally clear to me that every intensional type theory actually has an (∞,1)-categorical semantics without the consideration of the univalence axiom. I would make this clearer, but I am really out of my depth with type theories, so I’m just alerting you to the fact that this is stated confusingly

*almost everywhere*(the only place where it’s clear is in the page on identity types).

- Discussion Type
- discussion topicPreduals
- Category Latest Changes
- Started by TobyBartels
- Comments 9
- Last comment by TobyBartels
- Last Active Aug 6th 2012

Not much here, but: predual.

- Discussion Type
- discussion topicInclusion-exclusion
- Category Latest Changes
- Started by TobyBartels
- Comments 5
- Last comment by Mike Shulman
- Last Active Aug 6th 2012

New page: inclusion-exclusion principle

- Discussion Type
- discussion topicDuals
- Category Latest Changes
- Started by TobyBartels
- Comments 1
- Last comment by TobyBartels
- Last Active Aug 6th 2012

- Discussion Type
- discussion topicmonomorphism in an (oo,1)-category
- Category Latest Changes
- Started by Urs
- Comments 9
- Last comment by Mike Shulman
- Last Active Aug 5th 2012

- Discussion Type
- discussion topicPositive cones.
- Category Latest Changes
- Started by TobyBartels
- Comments 26
- Last comment by TobyBartels
- Last Active Aug 5th 2012

New page: positive cone, including the extended positive cone of a

*W*^{*}-module.

- Discussion Type
- discussion topicLambert W function
- Category Latest Changes
- Started by Todd_Trimble
- Comments 3
- Last comment by TobyBartels
- Last Active Aug 2nd 2012

Wrote Lambert W function. It was an excuse to record Joyal’s proof of Cayley’s theorem on the number of tree structures one can put on an $n$-element set (which is $n^{n-2}$).

- Discussion Type
- discussion topiciterated monoidal category
- Category Latest Changes
- Started by Todd_Trimble
- Comments 1
- Last comment by Todd_Trimble
- Last Active Aug 1st 2012

I’ve been inactive here for some months now; I hope this will significantly change soon.

I have written a stubby beginning of iterated monoidal category, with what is admittedly a conjectural definition that aims to be slick. I am curious whether anyone can help me with the following questions:

Is the definition correct (i.e., does it unpack to the usual definition)? If so, is there a good reference for that fact?

Assuming the definition is correct, it hinges on the notion of

*normal*lax homomorphism (between pseudomonoids in a 2-category with 2-products). Why the normality?

In other words (again assuming throughout that the definition is correct), it would seem natural to consider the following type of iteration. Start with any 2-category with 2-products $C$, and form a new 2-category with 2-products $Mon(C)$ whose 0-cells are pseudomonoids in $C$, whose 1-cells are lax homomorphisms (with no normality condition, viz. the condition that the lax constraint connecting the units is an isomorphism), and whose 2-cells are lax transformations between lax homomorphisms. Then iterate $Mon(-)$, starting with $C = Cat$. Why isn’t this the “right” notion of iterated monoidal category, or in other words, why do Balteanu, Fiedorowicz, Schwänzel, and Vogt in essence replace $Mon(-)$ with $Mon_{norm}(-)$ (where all the units are forced to coincide up to isomorphism)?

Apologies if these are naive questions; I am not very familiar with the literature.

- Discussion Type
- discussion topicExcision
- Category Latest Changes
- Started by Tim_Porter
- Comments 1
- Last comment by Tim_Porter
- Last Active Jul 30th 2012

I created a stub on excision, but this is just a link to the Wikipedia page for the moment.

- Discussion Type
- discussion topicConcrete and abstract structures.
- Category Latest Changes
- Started by TobyBartels
- Comments 4
- Last comment by Mirco Richter
- Last Active Jul 28th 2012

Concrete, abstract: group actions, groups; concrete categories, categories; Cartesian spaces, vector spaces; von Neumann algebras, $W^*$-alebras; material sets, structural sets; etc. At concrete structure.

- Discussion Type
- discussion topiccategory with star-morphisms
- Category Latest Changes
- Started by porton
- Comments 16
- Last comment by porton
- Last Active Jul 26th 2012

- I've added the following two new (related) pages to nLab wiki:

category with star-morphisms

abrupt category

These concept aroused in my research of what I call cross-composition product (a stub in the wiki).

See my research, especially this manuscript for details and examples.

- Discussion Type
- discussion topicoverview over group schemes
- Category Latest Changes
- Started by Stephan A Spahn
- Comments 1
- Last comment by Stephan A Spahn
- Last Active Jul 21st 2012

I wrote an overview over some constructions on- and examples of group schemes.

- Discussion Type
- discussion topicnotes from String-Math 2012
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jul 21st 2012

as some of you will have seen, I had spent part of the last week with attending talks at

*String-Math 2012*and posting some notes about these, to the $n$Café (here). For many of these notes I added material to existing $n$Lab entries (mostly just references) or created $n$Lab entries (mostly just stubs).But since at the same time I was also finalizing the writup of an article as well as doing yet some other things, the whole undertaking was a bit time-pressured. As a result, I decided it would be too much to announce every single $n$Lab edit that I did here on the $n$Forum.

So I ask you for understaning that hereby I just collectively announce these edits here: those who care should please scan through the list of blue links here and see if they spot pointers to $n$Lab entries where they would like to check out the recent edits.

I think I can guarantee, though, that in all cases I did edits that should be entirely uncontroversial, their main defect being that in many cases they leave one wish for more exhaustive discussion.

- Discussion Type
- discussion topiccategorification in representation theory
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jul 17th 2012

added some references by Catahrina Stroppel at the end of

*categorification in representation theory*(also added the words “representation theory” to the entry itself :-)

- Discussion Type
- discussion topicNew page: [[structured set]]
- Category Latest Changes
- Started by TobyBartels
- Comments 4
- Last comment by TobyBartels
- Last Active Jul 16th 2012

I've been meaning to write this for a while. Now I need to look at Bourbaki this weekend to explain their approach.

- Discussion Type
- discussion topicTowards QFT
- Category Latest Changes
- Started by fpaugam
- Comments 2
- Last comment by TobyBartels
- Last Active Jul 15th 2012

- Hi guys,

The situation with my habilitation has been resolved.

I decided to postone it to more favourable times.

You can refer to my book and link it.

Best,

Frédéric

- Discussion Type
- discussion topicRadon–Nikodym derivatives.
- Category Latest Changes
- Started by TobyBartels
- Comments 2
- Last comment by hilbertthm90
- Last Active Jul 14th 2012

New page: Radon–Nikodym derivative.

- Discussion Type
- discussion topicPure and mixed states.
- Category Latest Changes
- Started by TobyBartels
- Comments 3
- Last comment by TobyBartels
- Last Active Jul 14th 2012

I moved some material from state to create pure state (redirect from mixed state).

- Discussion Type
- discussion topicquantum affine algebra
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jul 13th 2012

I have created a stub

*quantum affine algebra*as a means to collect some references, alluded to here.If there is any expert on the matter around, he or she should please feel invited to add an illuminating Idea-section to the entry.

- Discussion Type
- discussion topiccalculus, types and trees
- Category Latest Changes
- Started by Stephan A Spahn
- Comments 10
- Last comment by Mike Shulman
- Last Active Jul 12th 2012

I created types and calculus and seven trees in one. Both entries as yet contain just references.

It would be nice to have more articles expanding on the reltion of calculus and (higher) category theory /type theory.

- Discussion Type
- discussion topicconjugacy class
- Category Latest Changes
- Started by Urs
- Comments 9
- Last comment by zskoda
- Last Active Jul 11th 2012

created

*conjugacy class*

- Discussion Type
- discussion topicmetaplectic representation
- Category Latest Changes
- Started by zskoda
- Comments 2
- Last comment by Urs
- Last Active Jul 11th 2012

New stub metaplectic representation, for now containing only some references.

- Discussion Type
- discussion topicdiagram of LCTVS properties
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jul 10th 2012

Maybe I am not searching correctly, but it seems to me that until 2 minutes ago the rather remarkable

*diagram of LCTVS properties*was linked to from exactly none non-meta $n$Lab page. It was effectively invisble unless one explicitly searched for “SVG”.Let me know if there is a reason for it remaining invisible. Assuming that there isn’t, I have now added it to

*locally convex space*and to*functional analysis - contents*(which I restructured slightly, moving the*two*such overview diagrams prominently to the top, where they can be recognized as what they are).

- Discussion Type
- discussion topicmetaplectic structure
- Category Latest Changes
- Started by Urs
- Comments 8
- Last comment by Urs
- Last Active Jul 10th 2012

stub for

*metaplectic structure*

- Discussion Type
- discussion topicreduction of structure groups
- Category Latest Changes
- Started by Urs
- Comments 3
- Last comment by Urs
- Last Active Jul 10th 2012

added a few more

*Examples*to*reduction of structure groups*.

- Discussion Type
- discussion topicmetalinear structure
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jul 10th 2012

created

*metalinear structure*. Added it to*square roots of line bundles - table*. Linked to it from Theta characteristic and so forth.

- Discussion Type
- discussion topicmetalinear group
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jul 10th 2012

started

*metalinear group*

- Discussion Type
- discussion topic(infinity,1)-pullback
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jul 10th 2012

Danny Stevenson was so kind and completed spelling out the proof of the pasting law for $\infty$-pullbacks here at

*(infinity,1)-pullback*.

- Discussion Type
- discussion topicKirchhoff's laws
- Category Latest Changes
- Started by Urs
- Comments 7
- Last comment by Urs
- Last Active Jul 10th 2012

I created a stub for

*Kirchhoff’s laws*to go with the $n$Café-discussion here. Maybe somebody feels like expanding it, I don’t really have the time for this right now.

- Discussion Type
- discussion topicsymplectic reduction - table
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jul 5th 2012

I have created an entry

*symplectic reduction - table*and included it into relevant entries.

- Discussion Type
- discussion topicHamiltonian action
- Category Latest Changes
- Started by Urs
- Comments 12
- Last comment by Urs
- Last Active Jul 4th 2012

I wrote

*Hamiltonian action*.I tried to say precisely what the action is by. In the literature (but also in a previous version of our

*moment map*entry) there is often (for instance on Wikipedia, but also in many other sources) an imprecise (not to say: wrong) statement, where an action by Hamiltonian vector fields is not distinguished from one*by Hamiltonians*.

- Discussion Type
- discussion topicsymplectic reduction
- Category Latest Changes
- Started by Urs
- Comments 2
- Last comment by jim_stasheff
- Last Active Jul 4th 2012

I have decided to splitt off a stand-alone entry

*symplectic reduction*from*BRST-BV formalism*(which used to be the redirect). Still just a stub. Lots of material and references still needs to be copied or moved from the latter to the former.

- Discussion Type
- discussion topicgeometric quantization - contents
- Category Latest Changes
- Started by Urs
- Comments 14
- Last comment by Urs
- Last Active Jul 3rd 2012

I have started a table

*geometric quantization - contents*and added it as a floating TOC to the relevant entries.Parts of this remain a bit unfinished. The $n$Lab is pretty much unusable in the last hours. I’ll give up now, have wasted too much time with this already. Maybe later it has recovered.

- Discussion Type
- discussion topicholographic principle
- Category Latest Changes
- Started by Urs
- Comments 23
- Last comment by Urs
- Last Active Jul 3rd 2012

added a one-sentence Idea to holographic priniciple and added much of the references now also at self-dual higher gauge theory

- Discussion Type
- discussion topicgeometric quantization extensions - table
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jul 2nd 2012

I have created a table

*geometric quantization extensions - table*.Mostly I have been editing aspects of the entries listed in this table here and there. Also included the table in the Properties-section of various of these entries.

- Discussion Type
- discussion topicrepresentation theory - contents
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jul 2nd 2012

I have started a table of contents

*representation theory - contents*(based on the link list at*representation theory*) and started adding it as a floating table of contents to relevant entries.But I ran out of steam before being entirely satisfied with the result.

- Discussion Type
- discussion topicIHL manifold
- Category Latest Changes
- Started by Urs
- Comments 10
- Last comment by DavidRoberts
- Last Active Jul 2nd 2012

stub for

*IHL manifold*.

- Discussion Type
- discussion topicinfinite dimensional manifold
- Category Latest Changes
- Started by Urs
- Comments 2
- Last comment by Tim_Porter
- Last Active Jul 1st 2012

I realized that

*infinite-dimensional manifold*and all entries related to it are still very stubby.I am not attempting to change this now, but I thought a first step to make progress is to list what stubs we actually have. I came up with this list

and added it to

*manifolds and cobordisms - contents*and made sure that all these entries point to each other.Now somebody go and add more content to these entries! :-)

- Discussion Type
- discussion topichigher geometric quantization
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jun 30th 2012

In case you see the activity in the logs and are wondering, I should say that I have been working on a new entry

*higher geometric quantization*(that used to redirect to n-plectic infinity-groupoid).I have started adding some survey-tables. But not done yet with the entry as a whole.

- Discussion Type
- discussion topichomotopy-homology-cohomology
- Category Latest Changes
- Started by Urs
- Comments 7
- Last comment by Urs
- Last Active Jun 30th 2012

I felt it was time for another table:

*homotopy-homology-cohomology*The structure is just a first attempt, begun in a brief moment of leisure. I’ll try to think about how to improve on it. Let me know what you think.

I have started to include this into relevant entries.

- Discussion Type
- discussion topicassociated oo-bundle
- Category Latest Changes
- Started by Urs
- Comments 10
- Last comment by Urs
- Last Active Jun 29th 2012

started an entry associated infinity-bundle

in order to summarize the thesis by Matthias Wendt on associated $\infty$-bundles in arbitrary $(\infty,1)$-toposes, generalizing the classical old results by Stasheff and May from $\infty Grpd$.

Also added some remarks on the relation to the discussion at principal infinity-bundle. Hopefully to be continued tomorrow.

- Discussion Type
- discussion topicstructures in a cohesive oo-topos
- Category Latest Changes
- Started by Urs
- Comments 12
- Last comment by Urs
- Last Active Jun 28th 2012

I am now going through the section Structures in a cohesive oo-topos and polish and expand the discussions there.

First thing I went through is the subsection Geometric homotopy and Galois theory. It gives the definition of the fundamental $\infty$-groupoid functor, a proposition on its consistency (which we had mentioned elsewhere), the definition of locally constant $\infty$-stacks in the sense of $Disc Aut(F)$-principal $\infty$-bundles, and then the central theorem of Galois theory, proven by applying the $\infty$-Yoneda lemma iteratively.

(This is material appearing in one form or other in other entries and at this point does not invoke the $\infty$-locality, but I want to have here all in one place a nice comprehensive discussion of the whole situation in a cohesive $\infty$-topos.)

- Discussion Type
- discussion topicbundles - contents
- Category Latest Changes
- Started by Urs
- Comments 4
- Last comment by Urs
- Last Active Jun 27th 2012

I found it was time to have a general table of contents

*bundles - contents*to be added as a floating table to the relevant entries. So I started one.

- Discussion Type
- discussion topicNekrasov functions and AGT conjecture
- Category Latest Changes
- Started by zskoda
- Comments 1
- Last comment by zskoda
- Last Active Jun 25th 2012

Stubs (just to provide the links to the basic references so far) for Nekrasov functions, AGT conjecture, and, less related, spectral networks.

- Discussion Type
- discussion topicsuppressed reference
- Category Latest Changes
- Started by fpaugam
- Comments 1
- Last comment by fpaugam
- Last Active Jun 22nd 2012

- Hi guys,

I suppressed the reference to my course on global analytic geometry. These notes were not well written enough and i put them into the basket. Please, don't pull back the reference.

Cheers,

Fred

- Discussion Type
- discussion topicminimal fibration
- Category Latest Changes
- Started by Stephan A Spahn
- Comments 8
- Last comment by Urs
- Last Active Jun 21st 2012

I created minimal fibration which could be merged with minimal Kan fibration. The idea-section says that this notion is needed to give a well defined notion of n-category. However there are other applications which I didn’t mention.

- Discussion Type
- discussion topicring extension
- Category Latest Changes
- Started by Urs
- Comments 2
- Last comment by Tim_Porter
- Last Active Jun 20th 2012

started a stub for

*ring extension*to go with the Café-discussion here.

- Discussion Type
- discussion topicfinite (infinity,1)-limit
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jun 19th 2012

I have added two statements from HTT to

*finite (infinity,1)-limit*in a new section*Preservation of finite (oo,1)-limits*.(Maybe that should rather go to left exact (infinity,1)-functor…)

- Discussion Type
- discussion topiccarrying
- Category Latest Changes
- Started by Urs
- Comments 2
- Last comment by Mike Shulman
- Last Active Jun 16th 2012

created

*carrying*

- Discussion Type
- discussion topicinfinite-dimensional Chern-Simons theory
- Category Latest Changes
- Started by Urs
- Comments 2
- Last comment by DavidRoberts
- Last Active Jun 15th 2012

just heard an interesting talk by Steven Rosenberg on CS invariants on infinite-dimensional manifolds. So I created an entry

*infinite-dimensional Chern-Simons theory*in order to record some references

- Discussion Type
- discussion topicover quasi-category
- Category Latest Changes
- Started by Urs
- Comments 3
- Last comment by Urs
- Last Active Jun 14th 2012

and handful of further details at over quasi-category

- Discussion Type
- discussion topicAzumaya algebra
- Category Latest Changes
- Started by Urs
- Comments 1
- Last comment by Urs
- Last Active Jun 13th 2012

earlier today I had added at

*Azumaya algebra*a new section*In terms of (derived) étale cohomology*with some notes that I took during a talk by David Gepner. He has a quite beautiful picture. Maybe I find the time to expand a bit on this entry and related entries.

- Discussion Type
- discussion topicOnline Resources, math institutions, math archives
- Category Latest Changes
- Started by zskoda
- Comments 6
- Last comment by zskoda
- Last Active Jun 9th 2012

I made redirects to Online Resources, namely the math blogs, online resources. Before we were complaining to Online Resources for many reasons including that it is not of all resources but only of blogs and wikis in relevant areas. No list of main institutes and archives like arXiv, numdam, jstor etc. there. As the list is long, and hard to scroll, I suggest not to add those to the current page. I think we should rename the current page to math blogs eventually and keep Online Resources (especially because of John's reference in his AMS Notices paper) as a redirect and create new pages for other stuff as well as organize the whole system around a top page math resources which will link to math blogs, math archives, math institutions (and maybe more) as well as very comprehensive central AMS-kept list of math resources.

I know it is not only about math here, but math is a short abbreviation for page name.

Up to now I have realized a large part of an above program, see math archives, math institutions and the supposed top resource page math resources, except that I was cautious not to rename the page Online Resources as people may disagree even with keeping the old redirect and because it may be tricky with the cache bug, while the page is of central importance. I think it would be useful if the pages like math institutions and the top page math resources stay not much longer than they are now, to have quick links and nice readability/visibility. This is the most effective organization, I think. For smaller institutions societies and alternative small lists of resources, it is better to go via links at AMS, EMS and IMU which are already efefctively linked. We can not do better there than those societies do, apart from listing few extra

**main**resources of our main interest. We can have a separate page just for categories or some other things. But the list of blogs is of different character, unlike going to AMS page or jstor, one does not need to go that quickly through list of less-organized stuff like blogs. So the blog list math blogs should grow indefinitely...I have chosen plural as before in these pages, without singular redirect at the moment.

- Discussion Type
- discussion topicRelation between type theory and category theory
- Category Latest Changes
- Started by DavidRoberts
- Comments 4
- Last comment by Mike Shulman
- Last Active Jun 6th 2012

Added the reference

Maria Emilia Maietti, Modular correspondence between dependent type theories and categories including pretopoi and topoi, Math. Struct. in Comp. Science (2005), vol. 15, pp. 1089–1149