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    • Created page with definitions and some examples.

      v1, current

    • Created page about Novikov fields, another kind of generalized power series field. I’m looking for a good notation for these along the lines of k[[x]]k[[x]] for power series rings, k((x))k((x)) for Laurent series fields, k((x G))k((x^G)) for Hahn series fields; the only notation in the literature seems to be Λ(k)\Lambda(k), which doesn’t suggest its meaning to me and clashes with exterior algebras.

      v1, current

    • Created page, with examples and links

      v1, current

    • The cut rule for linear logic used to be stated as

      If Γ⊢A\Gamma \vdash A and A⊢ΔA \vdash \Delta, then Γ⊢Δ\Gamma \vdash \Delta.

      I don’t think this is general enough, so I corrected it to

      If Γ⊢A,Φ\Gamma \vdash A, \Phi and Ψ,A⊢Δ\Psi,A \vdash \Delta, then Ψ,Γ⊢Δ,Φ\Psi,\Gamma \vdash \Delta,\Phi.

    • a minimum, just so that the link works

      v1, current

    • This is my first (substantial) contribution to the nLab, so forgive my likely ineptitude. This wants to be a initial stub, everything is basically scraped from the reference and this post: https://golem.ph.utexas.edu/category/2019/07/structured_cospans.html Clearly a lot of material can be added, included a better definition and clearer examples. It’s also quite necessary to make a page for decorated cospans. I might start it myself later this month.

      mattecapu

      v1, current

    • TODO: section 4 of the paper, and examples.

      mattecapu

      v1, current

    • Someone anonymous (probably from Gottingen) had changed simplicial homotopy. The old version seems to have had a different convention on the ordeing of the parts which was not ’wrong’ but was slightly different from some sources. I have added a note to the entry pointing out the existence of different conventions, and have cleaned up the use of Δ n\Delta^n instead of the more usual Δ[n]\Delta[n] in that entry.

      I checked back in the linked entry simplex, there, and found that the entry was a bit confusing as to the simplicial set Δ[n]\Delta[n]. I have altered the structure and wording slightly to clarify things (I hope).

    • added pointer to today’s

      • Matthew Headrick, Lectures on entanglement entropy in field theory and holography (arXiv:1907.08126)

      diff, v3, current

    • Fixed link to Leonardo Rastelli, Lectures on open/closed string duality

      Anonymous

      diff, v3, current

    • added to coalgebra for an endofunctor the example of the real line as the terminal coalgebra for some endofunctor on Posets.

      There are more such characterizations of the real line, and similar. I can't dig them out right now as I am on a shky connection. But maybe somebody else can. Or I'll do it later.

    • Create page to complete a link.

      v1, current

    • created the page for Mealy morphisms and just put in one reference

      Tim Hosgood

      v1, current

    • Created new entry on Moore machines to link with new entry on Meely machines.

      v1, current

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