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In 12.3 there is a feature of Zypper for this: use zypper install 'tex(<<package filename.extension>>) So for you this will be (Withoutput) bash:>zypper install 'tex(lgreek.sty)' Loading repository data... Reading installed packages... 'tex(lgreek.sty)' not found in package names. Trying capabilities. Resolving package dependencies... ...


Here's a way with a new math symbol font: \documentclass{article} \usepackage[LGR,T1]{fontenc} \usepackage{bm} \DeclareSymbolFont{upgreek}{LGR}{cmr}{m}{n} \SetSymbolFont{upgreek}{bold}{LGR}{cmr}{bx}{n} \DeclareMathSymbol{\upalpha}{\mathord}{upgreek}{`a} \DeclareMathSymbol{\upbeta}{\mathord}{upgreek}{`b} \DeclareMathSymbol{\upgamma}{\mathord}{upgreek}{`g} ...


There is no difference. The character Σ is translated into \u8:Σ which is a single macro whose name is five character long, because Σ is two byte in UTF-8. This macro, in turn, is translated into \IeC{\textSigma} and, in a typesetting context, it becomes \textSigma The definition of this macro is \LGR-cmd \textSigma \LGR\textSigma which is three ...


Another setting that helps with switching from one language to another in Lyx is to use the Text style dialog. So highlight the text that is in the Greek language, click the toolbar button: and then select Greek from the Language drop-down menu:

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