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When, within an equation environment, a \left\{ is closed with a \right. as with a display of alternative cases, the \end{equation} leaves the input indented by one level. Example: cumulative sum of the point to point phase shifts, after these are mapped into $-\pi < \Delta \phi_i \le \pi$, i.e.: \begin{equation} \label{eq:contiguation} \phi^{\mathrm{(c)}}_{\mathrm{i}} = \left\{ \begin{array}[c]{lll} \phi^{\mathrm{(c)}}_{\mathrm{i-1}} + (\phi_{\mathrm{i}}-\phi_{\mathrm{i-1}}) & \mbox{if} & -\pi < \phi_{\mathrm{i}}-\phi_{\mathrm{i-1}} \leqslant \pi \\ \phi^{\mathrm{(c)}}_{\mathrm{i-1}} + (\phi_{\mathrm{i}}-\phi_{\mathrm{i-1}}) - 2 \pi & \mbox{if} & \phi_{\mathrm{i}}-\phi_{\mathrm{i-1}} > \pi \\ \phi^{\mathrm{(c)}}_{\mathrm{i-1}} + (\phi_{\mathrm{i}}-\phi_{\mathrm{i-1}}) + 2\pi & \mbox{if} & \phi_{\mathrm{i}}-\phi_{\mathrm{i-1}} \leqslant -\pi \end{array} \right. . \end{equation} This has the property that there are qualitative changes to the behaviour if aliasing occurs. Not sure if it is as simple as not counting \{ when computing the indentation or if that would open a whole other can of worms. Emacs : GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.38, cairo version 1.17.8) Package: 13.2 current state: ============== (setq AUCTeX-date "2023-05-29" window-system 'x LaTeX-version "2e" TeX-style-path '("/var/auctex" "/usr/share/emacs/site-lisp/auctex/style" "/home/james/.emacs.d/auctex/auto" "/home/james/.emacs.d/auctex/style" "auto" "style") TeX-auto-save nil TeX-parse-self nil TeX-master t TeX-command-list '(("TeX" "%(PDF)%(tex) %(file-line-error) %`%(extraopts) %S%(PDFout)%(mode)%' %(output-dir) %t" TeX-run-TeX nil (plain-tex-mode ams-tex-mode texinfo-mode) :help "Run plain TeX") ("LaTeX" "%`%l%(mode)%' %T" TeX-run-TeX nil (latex-mode doctex-mode) :help "Run LaTeX") ("Makeinfo" "makeinfo %(extraopts) %(o-dir) %t" TeX-run-compile nil (texinfo-mode) :help "Run Makeinfo with Info output") ("Makeinfo HTML" "makeinfo %(extraopts) %(o-dir) --html %t" TeX-run-compile nil (texinfo-mode) :help "Run Makeinfo with HTML output") ("AmSTeX" "amstex %(PDFout) %`%(extraopts) %S%(mode)%' %(output-dir) %t" TeX-run-TeX nil (ams-tex-mode) :help "Run AMSTeX") ("ConTeXt" "%(cntxcom) --once --texutil %(extraopts) %(execopts)%t" TeX-run-TeX nil (context-mode) :help "Run ConTeXt once") ("ConTeXt Full" "%(cntxcom) %(extraopts) %(execopts)%t" TeX-run-TeX nil (context-mode) :help "Run ConTeXt until completion") ("BibTeX" "bibtex %(O?aux)" TeX-run-BibTeX nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode context-mode) :help "Run BibTeX") ("Biber" "biber %(output-dir) %s" TeX-run-Biber nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Run Biber") ("Texindex" "texindex %s.??" TeX-run-command nil (texinfo-mode) :help "Run Texindex") ("Texi2dvi" "%(PDF)texi2dvi %t" TeX-run-command nil (texinfo-mode) :help "Run Texi2dvi or Texi2pdf") ("View" "%V" TeX-run-discard-or-function t t :help "Run Viewer") ("Print" "%p" TeX-run-command t t :help "Print the file") ("Queue" "%q" TeX-run-background nil t :help "View the printer queue" :visible TeX-queue-command) ("File" "%(o?)dvips %d -o %f " TeX-run-dvips t (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Generate PostScript file") ("Dvips" "%(o?)dvips %d -o %f " TeX-run-dvips nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Convert DVI file to PostScript") ("Dvipdfmx" "dvipdfmx -o %(O?pdf) %d" TeX-run-dvipdfmx nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Convert DVI file to PDF with dvipdfmx") ("Ps2pdf" "ps2pdf %f %(O?pdf)" TeX-run-ps2pdf nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Convert PostScript file to PDF") ("Glossaries" "makeglossaries %(d-dir) %s" TeX-run-command nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Run makeglossaries to create glossary file") ("Index" "makeindex %(O?idx)" TeX-run-index nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Run makeindex to create index file") ("upMendex" "upmendex %(O?idx)" TeX-run-index t (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Run upmendex to create index file") ("Xindy" "texindy %s" TeX-run-command nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Run xindy to create index file") ("Check" "lacheck %s" TeX-run-compile nil (latex-mode) :help "Check LaTeX file for correctness") ("ChkTeX" "chktex -v6 %s" TeX-run-compile nil (latex-mode) :help "Check LaTeX file for common mistakes") ("Spell" "(TeX-ispell-document \"\")" TeX-run-function nil t :help "Spell-check the document") ("Clean" "TeX-clean" TeX-run-function nil t :help "Delete generated intermediate files") ("Clean All" "(TeX-clean t)" TeX-run-function nil t :help "Delete generated intermediate and output files") ("Other" "" TeX-run-command t t :help "Run an arbitrary command") ) )
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