Csdrhrt

Καλημέρα!

If I use the package bm, I have problems with the newcommand{hm}{mathop{}!text{ημ} mathop{}!}.

N.B.: I don't have problems with the mathop{}!text{ημ} mathop{}!, but with the newcommand{hm}{mathop{}!text{ημ} mathop{}!}

As I 'm saying, the strange is that the code:

documentclass[a4paper,11pt]{book}

usepackage{amsmath, amsthm, amssymb, amsfonts}



usepackage{mathtools}

usepackage[english,greek]{babel}

usepackage[utf8]{inputenc}

usepackage{cmbright}

usepackage{kerkis}

usepackage{bm}



begin{document}



$mathop{}!text{ημ} mathop{}! x$



end{document}

is OK, but this code:

documentclass[a4paper,11pt]{book}

usepackage{amsmath, amsthm, amssymb, amsfonts}



usepackage{mathtools}

usepackage[english,greek]{babel}

usepackage[utf8]{inputenc}

usepackage{cmbright}

usepackage{kerkis}

usepackage{bm}



newcommand{hm}{mathop{}!text{ημ} mathop{}!}



begin{document}



$hm x$



end{document}

get's me an error.

What is happening?

Ευχαριστώ εκ των προτέρων!!!

You could do

renewcommand{hm}{...}

but there's a glitch: when bm does its work, it redefines hm. So hm x would produce the expected result, but bm{hm x} wouldn't and just render the “x”.

I suggest to use a different name, such as hmop.

I also suggest a different way to define such operators:

documentclass[a4paper,11pt]{book}

usepackage{cmbright}

usepackage{kerkis}

usepackage[utf8]{inputenc}

usepackage[english,greek]{babel}



usepackage{amsmath}

usepackage{bm}



DeclareMathAlphabet{mathgreek}{LGR}{maksf}{m}{n}

SetMathAlphabet{mathgreek}{bold}{LGR}{maksf}{bx}{n}



makeatletter

newcommand{DeclareGreekMathOperator}[2]{%

  begingroupletIeCtranslate@greek

  protected@edef@temp{#2}%

  edefx{endgroup

    unexpanded{DeclareMathOperator{#1}}%

    {noexpandmathgreek{unexpandedexpandafter{@temp}}}%

  }x

}

deftranslate@greek#1{csname LGRstring#1endcsname}

makeatother



DeclareGreekMathOperator{hmop}{ημ}



begin{document}



$mathop{}!text{ημ} mathop{}! x$



$hmop x$



$bm{hmop x}$



end{document}

Where's the advantage in such a complicated definition? Try your code in an italics context:

textit{abc $mathop{}!text{ημ} mathop{}! x$ def}

would print ημ in italics as well.

The hm macro is defined by package bm:

If there is a 'heavy' math version defined (usually accessed by a
user-command heavymath) then a similar command hm is defined
which access these 'ultra bold' fonts.

If you don't need it then use renewcommand{hm}{patati patata}.