Typesetting Dotless i and j with LaTeX

[cepheid]

I'm wondering how to get dotless i and j in LaTeX on the forums. For some reason, \i and \j don't work for this. I can use \imath and \jmath, and I can even get carets on them to represent unit vectors:

\hat{\imath}, \hat{\jmath}

The only remaining problem is that I can't get them to be typeset in boldface and upright as vectors traditionally are. If I do this hack:

\hat{\textbf{$\imath$}}, \hat{\textbf{$\jmath$}}

then I can get them boldface, but still not upright. I think that the glyphs for \imath and \jmath are inherently italicized and there is no way to change this. Any suggestions for the OCD among us?

 

[robphy]

From
http://groups.google.com/group/math...roup/mathjax-users/browse_frm/month/2010-11?&
MathJax can use unicode...

\mbox{abcdefgh}\ \unicode{x0131}\unicode{x0237}\ \mbox{klmnopqrstuvwyz}

You could define a macro for \i and \j
\def\i{\unicode{x0131}} \i \def\j{\unicode{x0237}} \j (right-click show source)

then use it later
\i i\mbox{i} \j j\mbox{j}

 

[cepheid]

From
http://groups.google.com/group/math...roup/mathjax-users/browse_frm/month/2010-11?&
MathJax can use unicode...

\mbox{abcdefgh}\ \unicode{x0131}\unicode{x0237}\ \mbox{klmnopqrstuvwyz}

You could define a macro for \i and \j
\def\i{\unicode{x0131}} \i \def\j{\unicode{x0237}} \j (right-click show source)

then use it later
\i i\mbox{i} \j j\mbox{j}

So, definitions that people make using \def are universal and permanent (or at least persist until some user gives the same macro a different definition)?

In any case, it still doesn't work:

\def\i{\unicode{x0131}} \hat{\mathbf{\i}}

 

[robphy]

How's this?

\def\ihat{\hat{\unicode{x0131}\!\!\unicode{x0131}}} \ihat \def\jhat{\hat{\unicode{x0237}\!\!\!\unicode{x0237}}} \jhat

8\ihat + 6\jhat

I suspect your \defs are local to your post.

 

[cepheid]

How's this?

\def\ihat{\hat{\unicode{x0131}\!\!\unicode{x0131}}} \ihat \def\jhat{\hat{\unicode{x0237}\!\!\!\unicode{x0237}}} \jhat

8\ihat + 6\jhat

I suspect your \defs are local to your post.

That's very interesting! I just read that \! inserts a small negative space. So you have two unicode dotless i's slightly overlapping each other to produce a thicker one. It's very clever. Why the extra space for the j? Why not:


\def\jhat{\hat{\unicode{x0237}\!\!\unicode{x0237}}} \jhat


Ah. That's why. A line thickness problem.