How to add \= ("macron", "overbar") in an equation?

Question

I am trying the following code

        \begin{equation}
        \bm{F}=\bm{F}_{vol}\={\bm{F}}
    \end{equation}

But it's some errors. I think the error might be because I cannot use macron in math environment. how can I resolve this?

What is \= supposed to produce? Are you perhaps looking for \bar? — egreg, Jan 22 '18 at 23:59
there is no overlap between diacritics for text and those for math, but for the ones common in math, there are parallel versions. the macron equivalent for math is \bar. — barbara beeton, Jan 23 '18 at 00:02

score 4 · Accepted Answer · answered Jan 23 '18 at 00:15

In general text accent commands uses symbol names: \= for macron \" for umlaut etc, and math accents (which are logically quite distinct) use words so \bar for an over bar accent, and \ddot for a double dot accent, etc. In the case of the bar sometimes \overline works better (that is not built using the math accent primitives, but is simply a rule drawn over the expression, but unlike \bar which is a fixed character from the font, \overline extends as needed to cover the expression.

How to add \= ("macron", "overbar") in an equation?

1 Answers1