# Theta hat dot: upright and bold

I've had endless problems trying to get bold, upright theta symbol, with a bold hat on top, and an ordinary dot on top of that.

I got most of the way, minus the dot, using the following code: (I got the unslanted theta code from here)

\documentclass{article}

\usepackage{mathtools}
\usepackage{scalerel}

\newsavebox{\foobox}
\newcommand{\slantbox}[2][0]{\mbox{%
\sbox{\foobox}{#2}%
\hskip\wd\foobox
\pdfsave
\pdfsetmatrix{1 0 #1 1}%
\llap{\usebox{\foobox}}%
\pdfrestore
}}
\newcommand\unslant[2][-.25]{%
\mkern1mu%
\ThisStyle{\slantbox[#1]{$\SavedStyle#2$}}%
\mkern-1mu%
}
\newcommand{\utheta}{\unslant\theta}

\begin{document}
$\boldsymbol{\mathrm{\hat{\utheta}}}$
\end{document}


This gives me an output of everything I want, except an ordinary dot on top:

As soon as I wrap the existing code in \dot{}, things go haywire, with error messages including lots of @ symbols, which I assume means I really messed something up. If anyone has a solution to this, it'd be much appreciated!

Things I don't want:

• A solution involving upgreek, since non-symmetrical versions of theta like that look ugly to me.
• The code $\boldsymbol{\mathrm{\dot{\hat{\utheta}}}}$ isn't what I'm looking for, since the dot is bold.
• Please no pmb.
• Solutions involving a change of font. I'm sticking with Computer Modern for this project.
• Is that hat centred over the theta? It looks slightly right of centre to me. (Maybe that is the desired outcome.) – LSpice Feb 23 '17 at 18:43
• It's not, but involving kerning would've made the question more complicated. – J-J Feb 23 '17 at 19:30

Stack a dot on top. The gap (currently .5pt) is adjustable with the optional argument to \stackon. EDITED to take Mico's advice (except with +/-1.3 mu instead of 1.5).

\documentclass{article}

\usepackage{mathtools}
\usepackage{scalerel,stackengine}
\stackMath

\newsavebox{\foobox}
\newcommand{\slantbox}[2][0]{\mbox{%
\sbox{\foobox}{#2}%
\hskip\wd\foobox
\pdfsave
\pdfsetmatrix{1 0 #1 1}%
\llap{\usebox{\foobox}}%
\pdfrestore
}}
\newcommand\unslant[2][-.25]{%
\mkern1.3mu%
\ThisStyle{\slantbox[#1]{$\SavedStyle#2$}}%
\mkern-1.3mu%
}
\newcommand{\utheta}{\mathord{\unslant\theta}}

\begin{document}
$\boldsymbol{\hat{\utheta}}$
and this
$\stackon[.5pt]{\boldsymbol{\hat{\utheta}}}{.}$
\end{document}


• Two suggestions: First, instead of deploying \mathrm, set \newcommand{\utheta}{\mathord{\unslant\theta}}. Second, increase the arguments of \mkern to 1.5mu and -1.5mu, respectively, to get better centering of \utheta below the stacked accents. – Mico Feb 21 '17 at 12:45
• @Mico Done...except used 1.3mu, since I felt 1.5mu overcompensated. – Steven B. Segletes Feb 21 '17 at 12:51
• It works like a charm :) Thanks a lot! I'll fiddle with the kerning myself till it looks decent. – J-J Feb 21 '17 at 13:04

I suggest you load both the upgreek (gulp...) and bm packages along with amsmath and write something along the lines of the code shown below.

\documentclass{article}
\usepackage{amsmath,upgreek,bm}
\begin{document}
$\dot{\bm{\hat{\uptheta}}}, \dot{\hat{\uptheta}}, \dot{\hat{\theta}}$
\end{document}

• I specifically don't want upgreek's ugly thetas. – J-J Feb 21 '17 at 12:55
• @Jean-JacqduPlessis - I did notice your aversion to the upgreek package in your initial posting. I chose to provide this answer anyway as it may be of interest to other readers of your posting. You are, of course, entirely free to disregard it. – Mico Feb 21 '17 at 12:57

\documentclass{article}

\usepackage{mathtools,bm}
\usepackage{scalerel}

\newsavebox{\foobox}
\newcommand{\slantbox}[2][0]{\mbox{%
\sbox{\foobox}{#2}%
\hskip\wd\foobox
\pdfsave
\pdfsetmatrix{1 0 #1 1}%
\llap{\usebox{\foobox}}%
\pdfrestore
}}
\newcommand\unslant[2][-.25]{%
\mkern1mu%
\ThisStyle{\slantbox[#1]{$\SavedStyle#2$}}%
\mkern-1mu%
}
\newcommand{\utheta}{\unslant\theta}

\begin{document}

$\dot{\boldsymbol{\hat{{\utheta}}}}$ $\boldsymbol{\dot{\hat{{\utheta}}}}$
\end{document}

• How does your answer differ (meaningfully) from Steven's? (I realize that writing {\utheta}, i.e., encasing \utheta in curly braces) is the same as defining the symbol to be of type mathord. ) – Mico Feb 21 '17 at 13:41
• @Mico ??? It's completely different isn't it? I place the dot using \dot{xxx} Steven uses \stackon[.5pt]{xxx}{.} not using the mathaccent primitive at all. – David Carlisle Feb 21 '17 at 13:57
• You're right. I had mistakenly focused on the code for \unslant and \slantbox (which came, via the OP, from another answer of Steven's). – Mico Feb 21 '17 at 14:13
• @DavidCarlislel to be fair, misunderstandings like Mico's are expected when "mic-drop" answers like this one don't supply any discussion or context beyond the code. – user1717828 Feb 21 '17 at 18:39
• Thanks, but this solution doesn't answer the question, as the dot is bold, which causes an inconsistency with other dots. – J-J Feb 23 '17 at 19:31