class svjour3 Package mathptmx Warning: There are no bold math fonts on input line nn
First of all you should not load amsmath
, amsfonts
and mathptmx
before \documentclass
. You also don't need fix-cm
, since you're using a different font set than Computer Modern.
The issue is simply that mathptmx
does not provide bold math fonts, whereas svjour3
applies \boldmath
to its sectional titles.
Use a font set based on Times that has bold math fonts.
\documentclass[smallextended,final]{svjour3} % onecolumn (second format)
%
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{newtxtext,newtxmath}
\usepackage{graphicx}
\usepackage[]{units}
\usepackage{enumitem}
\usepackage{booktabs}
\usepackage[toc,page]{appendix}
\usepackage{url}
\usepackage{hyperref}
\journalname{Found Phys}
\smartqed % flush right qed marks, e.g. at end of proof