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    • For now created page, and written definition. Work in progress! (No surgical cut-and-paste from other pages will be performed.)

      v1, current

    • the entry modular tensor category was lacking (among many things that it is still lacking) some pointers to literature that reviews the relation to QFT. I have added a handful, maybe the best one is this here:

    • some bare minimum, for the moment just a glorified list of references

      v1, current

    • Page created, but author did not leave any comments.

      v1, current

    • just for completeness, and ease of hyperlinking

      v1, current

    • in analogy to what I just did at classical mechanics, I have now added some basic but central content to quantum mechanics:

      • Quantum mechanical systems

      • States and observables

      • Spaces of states

      • Flows and time evolution

      Still incomplete and rough. But I have to quit now.

    • created a currently fairly empty entry quantum measurement, just so as to have a place where to give a commented pointer to the article

      • Klaas Landsman, Robin Reuvers, A Flea on Schrödinger’s Cat, Found. Phys. 43, 373-407 (2013) (arXiv:1210.2353)
    • In the category:people-entry “William Lawvere” I have created a subsection “Motivation from foundations of physics” where I want to collect pointers to where and how Lawvere was/is motivated from finding foundations for (classical continuum) physics.

      Explicit evidence for this that I am aware of includes notably the texts Toposes of laws of motion and the introduction to the book Categories in Continuum Physics.

      The Wikipedia entry has this about motivation from physics:

      Lawvere studied continuum mechanics as an undergraduate with Clifford Truesdell. He learned of category theory [...][...] found it a promising framework for simple rigorous axioms for the physical ideas of Truesdell and Walter Noll. [...][...] meeting on “Categories in Continuum Physics” in 1982. Clifford Truesdell participated in that meeting, as did several other researchers in the rational foundations of continuum physics and in the synthetic differential geometry which had evolved from the spatial part of Lawvere’s categorical dynamics program). Lawvere continues to work on his 50-year quest for a rigorous flexible base for physical ideas, free of unnecessary analytic complications.

      Question: Can anyone point me to more on this early phase of the story (graduate student is supposed to start to look into continuum mechanics, starts to wonder “What is a vector field, really?, what a differential equation?” and ends up revolutionizing the foundations of differential calculus)?

    • Page created, but author did not leave any comments.

      v1, current

    • Page created, but author did not leave any comments.


      v1, current

    • Page created, but author did not leave any comments.

      v1, current

    • We should have an entry on large N limit gradually. But sometimes it can be treated as a semiclassical limit. I quoted a reference by Yaffe where I originally read of that approach to the entry semiclassical expansion.

    • added pointer to today’s

      • V. Mishnyakov, A. Sleptsov, N. Tselousov, A new symmetry of the colored Alexander polynomial (arXiv:2001.10596)

      diff, v12, current

    • trying to collect references on the state-of-the-art of computer simiulations on cosmic structure formations. Will try to expand as I find more…

      v1, current

    • Added a lemma about fully faithful functors.

      Sorry for the mess, there does not seem to be a way to preview edits.

      diff, v3, current

    • splitting this off from AdS3/CFT2 as an entry just listing references, to be !includeed into the References-lists of other entries

      v1, current

    • added to the Idea-section (here) the description of PT-collapse as the function that assigns “asymptotic distance form the submanifold”, an illustrating graphics, and a comment that this represents the Cohomotopy charge of the submanifold

      diff, v26, current