Math & Science ⇒ open euclidean ball symbol

[Turkurz]

Hello,

does anyone know how to create the symbol for an open euclidean ball? In the literature, the symbol blackboard B is used with a little circle over it.

Code: Select all

\overset{\circ}{\mathbb{B}}

What I wish concerning the symbol is that the circle would be directly above the letter B, so that there would be no (or minimal) space between B and the circle (a sort of "tight" circle). I just want this so that the lines containing this symbol wouldn't have an increased height, cause it looks really ugly.

Anyone?

[localghost]

Code: Select all

\documentclass[11pt,a4paper]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{relsize}

\newcommand*{\EB}[1]{%
  \makebox[0pt][l]{%
    \kern.1em
    \raisebox{1.55ex}{\relsize{-3}{$\circ$}}
  }%
  #1%
}

\begin{document}
  $\EB{\mathbb{B}}$
\end{document}

Best regards
Thorsten

[CrazyHorse]

does anyone know how to create the symbol for an open euclidean ball? In the literature, the symbol blackboard B is used with a little circle over it.

Code: Select all

\overset{\circ}{\mathbb{B}}

What I wish concerning the symbol is that the circle would be directly above the letter B, so that there would be no (or minimal) space between B and the circle (a sort of "tight" circle). I just want this so that the lines containing this symbol wouldn't have an increased height, cause it looks really ugly.

Code: Select all

\documentclass[12pt]{article}
\usepackage{amssymb}
\usepackage{accents}

\begin{document}

$\mathring{\mathbb{B}}$

\end{document}

HErbert

[Turkurz]

Yesss.

Thank you for both solutions.

Best Regards, Turkurz