added pointer to today’s:

- Yosuke Imamura,
*Finite-$N$ superconformal index via the AdS/CFT correspondence*(arXiv:2108.12090)

added pointer to

- Masayasu Harada, Shinya Matsuzaki, and Koichi Yamawaki,
*Implications of holographic QCD in chiral perturbation theory with hidden local symmetry*, Phys. Rev. D 74, 076004 (2006) (doi:10.1103/PhysRevD.74.076004)

added this pointer:

- David Jorrin, Nicolas Kovensky, Martin Schvellinger,
*Towards $1/N$ corrections to deep inelastic scattering from the gauge/gravity duality*, JHEP 04 (2016) 113 (arXiv:1601.01627)

added this pointer on 1/N corrections in 2d QCD:

- Itzhak Bars,
*QCD and Strings in 2D*(arXiv:hep-th/9312018)

That would be fun if M-theory could help out with the four-colour problem!

]]>I wonder if Bar-Natan didn’t know that the double line construction he uses so effectively is earlier due to ’t Hooft, or if he intentionally chose to never cite him. Seems a curious omission.

]]>Thanks, excellent. So let’s add that to all related entries:

On the logical equivalence between the four-colour theorem and a statement about transition from the small N limit to the large N limit for Lie algebra weight systems on Jacobi diagrams via the ’t Hooft double line construction:

- Dror Bar-Natan,
*Lie Algebras and the Four Color Theorem*, Combinatorica 17-1(1997) 43–52 (arXiv:q-alg/9606016, doi:10.1007/BF01196130)

I was just reminded of John Baez years ago describing Bar-Natan’s paper on the four-color problem and the relation between $SU(2)$ and $SU(n)$ gauge theory. Bar-Natan’s paper is here.

]]>now some minimum in place.

]]>Starting something. Not done yet, but need to save.

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