= Lecture Notes on String Theory by Dan Israël
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{tag=Work by Dan Israël}
{title2=2022}
By <Dan Israël>. Master ICFP 2019–2020 lecture notes; front matter lists latest update 29 March 2022.
https://www.lpthe.jussieu.fr/~israel/notes.pdf
Verified primary text: section 5.2.3, printed pp. 118–120 (PDF pp. 120–122), equations (5.53), (5.57)–(5.60). The improved current has weight one at matter central charge 26. Its self-OPE retains higher-order poles; the simple-pole obstruction to nilpotence vanishes at criticality. The PDF text extraction loses derivatives in the simple-pole term; the wiki only reproduces the unambiguous higher-order terms and states residue cancellation.
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