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I am trying to typeset a vector with i-hat and j-hat components:



\newcommand{\ihat}{\mathbf {\hat \imath}}
\newcommand{\jhat}{\mathbf {\hat \jmath}}
\newcommand{\vect}[1]{\mathbf #1}

        \vect{F} &= 3\ihat + 4\jhat

However, \imath and \jmath will always be italicized, no matter what modifiers I apply \mathbf, \mathrm, etc.

How do I make \imath and \jmath bold and upright?

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The \mathrm command has no effect on \imath or \jmath. LaTeX is smart enough to remove the dot on the i or j when adding a hat. – Count Zero Sep 12 '11 at 14:07
Use bold roman for \jmath in latex command. – user79557 Jun 5 at 6:29

2 Answers 2

up vote 18 down vote accepted

For bold and upright, you could use the regular text-version of \imath and \jmath, which are \i and \j:


bold & upright i & j in math

Additionally, if you want the \hat to be bold as well, then use \boldsymbol.


Now with bold \hat

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\newcommand{\ihat}{\mathbf {\hat{\ii}}}
\newcommand{\jhat}{\mathbf {\hat{\jj}}}

The last line is a better definition of your \vect command.

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