If U+200B is in a mathematical neighborhood and outside, it causes a double definition of LyXZeroWidthSpace.
% Vista preliminar del código fuente %% LyX 2.4.3 created this file. For more info, see https://www.lyx.org/. %% Do not edit unless you really know what you are doing. \documentclass[12pt,spanish]{article} \usepackage[T1]{fontenc} \usepackage[latin9]{inputenc} \setlength{\parindent}{0bp} \usepackage{babel} \addto\shorthandsspanish{\spanishdeactivate{~<>}} \deactivatequoting \usepackage{float} \usepackage{amsmath} \usepackage{amsthm} \usepackage{geometry} \geometry{verbose,tmargin=2cm,bmargin=2cm,lmargin=2cm,rmargin=2cm} \usepackage{setspace} \onehalfspacing \usepackage[pdfusetitle, bookmarks=true,bookmarksnumbered=true,bookmarksopen=false, breaklinks=false,pdfborder={0 0 1},backref=false,colorlinks=false] {hyperref} \makeatletter %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% LyX specific LaTeX commands. \newcommand*\LyXZeroWidthSpace{\hspace{0pt}} \newcommand*\LyXZeroWidthSpace{\hspace{0pt}} %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands. \setlength{\parskip}{0.2cm} % Espacio entre párrafos \newcommand{\rrr}{\rule{5cm}{0.4pt}} \makeatother \begin{document} $a\LyXZeroWidthSpace bc$ AA\LyXZeroWidthSpace BBBB \end{document}
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