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If I type

\boldmath $\widetilde T$\unboldmath

I get widetilde T where unfortunately the tilde above the T is a little flimsy for my taste. Is there a better way to do this? I found a paper that has something, that appears a little bolder, in it. bigger tilde

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You are not using bm in that fragment (although bm would give the same) the default computer modern font set doesn't have a bold extension font so the wide tilde comes from cmex5 in both cases. –  David Carlisle Feb 26 '13 at 0:36
    
Thank you, you are right, I corrected the wording. –  Max Feb 26 '13 at 2:13
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2 Answers

Some approachs:

enter image description here

\documentclass{article}
\usepackage{graphicx,xcolor}
\usepackage{mathtools}
\begin{document}
\boldmath $\widetilde{T}$\unboldmath 
\color{blue!50!black} ~
% require graphicx
\resizebox{.8em}{1.1em}{\boldmath $\displaystyle \widetilde{\scriptstyle T}$\unboldmath}
% ooaling solution
\boldmath \ooalign{$\textstyle\widetilde{\phantom{W}}$\cr\hidewidth$T$\hidewidth\cr} \boldmath
% require mathtools
\boldmath $\mathrlap{\widetilde{\phantom{W}}}\,T$\unboldmath 
\end{document}
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I'm afraid you hit on something that can't be easily solved. Here for comparison all possible solutions for making math stuff bold and then a handmade bold tilde T:

\documentclass{standalone}
\usepackage{amsbsy}
\usepackage{bm}
\usepackage{fixmath}
\usepackage{graphicx}
\begin{document}
% not bold
$\widetilde T$
% not bold enough either
$\mathbf{\widetilde T}$
$\pmb{\widetilde T}$
\boldmath$\widetilde T$
$\boldsymbol{\widetilde T}$
$\bm{\widetilde T}$
$\mathbold{\widetilde T}$
% maybe even crayons would be easier and prettier but well ...
\raisebox{.7em}{\resizebox{.6em}{!}{\ensuremath{\bm{\sim}}}}\hspace{-.7em}$T$
\end{document}

enter image description here

Using .8em in the raisebox will be about the same height as the other tildes but I personally liked it better this way. I'm not saying it's pretty and I'm not saying it's easy :/

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