Mix of latin and greek script in source

Question

I need to have a mix of latin and greek in the source, like "The angle is 2θ".
I tried to use LuaLatex with usepackage[utf8]{luainputenc} but the greek characters are not rendered.
Modifying the text is not an option, for several reasons.
Thank you.

Ivan · Answer

You can use the alphabeta package:
documentclass{article}
usepackage{alphabeta}

begin{document}

The angle is 2θ

end{document}

Davislor · Answer

You can use any characters that your font supports, if you switch to the modern toolchain. Compile in LuaTeX or XeTeX, take out the inputenc and fontenc packages, and load a font that supports Greek, such as usepackage{newcomputermodern} or usepackage{libertinus}.

Answered by Davislor on July 24, 2021

Thruston · Answer

Another approach, using unicode-math and the TeX Gyre fonts.
documentclass{article}
usepackage{unicode-math}
setmainfont{TeX Gyre Pagella}
setmathfont{TeX Gyre Pagella Math}
begin{document}

The angle is 2θ in text.  The angle is $2θ$ in maths.

end{document}

Compile with xelatex or lualatex, and (provided you have the TeX Gyre fonts available) you will get:

Mix of latin and greek script in source

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