Math & Science ⇒ [solved] A \Vert symbol that scales?

[dedec0]

I have this code inside a .tex file:

Code: Select all

\subparagraph{(a)} $ \vert \sin(\theta) \vert =
    \Vert \frac{\overrightarrow{v}}{ \Vert \overrightarrow{v} \Vert }
        - \frac{\overrightarrow{u}}{ \Vert \overrightarrow{u} \Vert }
        \cos(\theta)
    \Vert $;

I want the two '\Vert' outside '\frac' operators to have the height of the fractions. How should i do to get exactly this, which i found in a math book?

With that code, i get this output: http://imgbox.com/8BGNE0ah

[Johannes_B]

Package physics might be a fit for you.

Code: Select all

\documentclass{article}
\usepackage{physics}
\begin{document}
(a) $ \abs{\sin(\theta)}=
   \norm{\frac{\overrightarrow{v}}{ \Vert \overrightarrow{v} \Vert }
    - \frac{\overrightarrow{u}}{ \Vert \overrightarrow{u} \Vert }
    \cos(\theta) }$;
\end{document}

[dedec0]

Package physics might be a fit for you.

Code: Select all

\documentclass{article}
\usepackage{physics}
\begin{document}
(a) $ \abs{\sin(\theta)}=
   \norm{\frac{\overrightarrow{v}}{ \Vert \overrightarrow{v} \Vert }
    - \frac{\overrightarrow{u}}{ \Vert \overrightarrow{u} \Vert }
    \cos(\theta) }$;
\end{document}

Beautiful! I find it strange that this command does not exist in the math packages i already have and use in this project. The book i said is not physics, it is a book about analytic geometry. Anyway, every time i used \Vert was thinking about the norm of a vector.

Just a note that may be useful to someone else too: i am compiling my code in Debian, with Texlive installed. I had to install the debian package "texlive-science" to get, among several others, the LaTeX 'physics' package.

Thank you

[dedec0]

Code: Select all

\vert (...) \vert           % to abs. value -> not best
\abs{ (...) }               % this is

\Vert (...) \Vert           % norm of vectors -> not the best either
\norm{ (...) }              % this is

Wikipedia was my source of secure information. But (today, now) it is wrong for this detail. Can someone less newbie than me update the section https://en.wikipedia.org/wiki/List_of_mathematical_symbols_by_subject#Vector_calculus_2 with the idea of what i said here?

[Johannes_B]

The symbols you found are the standard symbols and you can all scale them by hand. They are used by the physics package, which does the scaling for you.
Most advanced users prefer the manual scaling.