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1

\selectlanguage{english} \author{Foo} \title{Foobar} comes too early -- at the time of \maketitle, the language setting is the default greek (since this is the last language specified in the babel settings). You've to enclose \selectlanguage{english} \maketitle \selectlanguage{greek} for example. \documentclass[12pt]{report} \usepackage[utf8]{...


5

You can find the definitions employed by the paper's author by downloading the source file from arXiv. Those two symbols are there defined as: \newcommand{\DD}{\Delta\!\!\!\!\Delta} \newcommand{\Grad}{\nabla\!\!\!\!\nabla} Note that this might not be the best way to define symbols like those -- it's just the way used by the author -- and other answers ...


3

Run with xelatex or lualatex: \documentclass{article} \usepackage{unicode-math} \setmathfont{XITS Math} \def\dDelta{\upDelta\mkern-10mu\upDelta} \def\dNabla{\nabla\mkern-10mu\nabla} \begin{document} \Huge$\dDelta$ and $\dNabla$ \end{document} If you want the bold characters use \mbfDelta and \mbfnabla instead.


5

Here's a possible workaround if the symbols aren't available: Use the relevant symbol, say \Delta with negative kerning, say, \mkern-12u and the same symbol again. The kerning value is just a guess and can be changed of course. The package bbold provides a blackboard letter symbol for \Delta, but this looks different and is probably not desired. The ...


3

You can use CB fonts \documentclass{article} \usepackage[scaled=0.95]{helvet} \usepackage{sansmathfonts} \renewcommand{\familydefault}{\sfdefault} \DeclareFontEncoding{LGR}{}{} \DeclareSymbolFont{sfgreek}{LGR}{cmss}{m}{n} \SetSymbolFont{sfgreek}{bold}{LGR}{cmss}{bx}{n} \DeclareMathSymbol{\alpha}{\mathord}{sfgreek}{`a} \DeclareMathSymbol{\beta}{\mathord}{...


1

This answer comes following discussion in the comments to the question, to which I refer the reader. I pointed out that my solution at Upright Greek font fitting to Computer Modern works directly at unslanting a font (it is based on Bruno's answer at Shear transform a "box"). I show there how to apply it to greek letter forms, but noted that it ...


1

Alternative, you can use the XITS fonts for both math and text. \documentclass{article} \usepackage{mathtools} \usepackage{unicode-math}% loads fontspec \usepackage{polyglossia} \setdefaultlanguage{english} \setotherlanguage[variant=modern]{greek} \defaultfontfeatures{Mapping=tex-text} \setromanfont[Mapping=tex-text]{XITS} \setmathfont{XITS Math} \begin{...


2

newtxtext doesn't support the Greek language; besides, you're using fontspec and XeLaTeX, so newtxtext is out of the question to begin with. Set a Times like text font supporting Greek, for instance Tempora. \documentclass[11pt,a4paper]{article} \usepackage{amssymb} \usepackage{amsmath} \usepackage{newtxmath} \usepackage[no-math]{fontspec} \usepackage{...



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