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5. There are three such combining accents in Unicode, which are available in unicode-math as \bar, \overbar and \overline. Some of these accents will combine into a single bar if you put them over consecutive symbols, and you probably do not want that. (If you do, you want to put a single \overline on both, since the two symbols might have ...
I have indeed observed a difference between \overline and \bar: Having 3 lines of formula in one \align environment, using overline in combination with a 3rd power like this: \overline{b}^3. causes the 3rd equation to need more vertical space and the 3rd equation was shifted down a bit, which looked quite disturbing. Using. \bar{b}^3.
The fact that the width is 9mu is confirmed by the definition of \hbar in Plain TeX: \hbar: macro:->{\mathchar '26\mkern -9muh} Of course, different math fonts may need different amounts of spacing. A possibly better definition is. \newcommand{\dbar}{{d\mkern-7mu\mathchar'26\mkern-2mu}} so that the bar doesn't protrude as much on the right:
I want to represent, say, the closure of a set or the extended reals, e.g., $\bar{\mathbb{R}}$ but unfortunately this creates a bar that is much too small (horizontally) and can barely be seen. On the other hand, $\overline{\mathbb{R}}$ creates a line that is too long. I need something that's just right, in between the bar and the overline.
This post was also very helpful for me as I've had a similar problem. I am using \bar and this solution. \usepackage{stackengine} \newcommand\barbelow[1]{\stackunder[1.2pt]{$#1$}{\rule{.8ex}{.075ex}}} to underline in math mode. Unfortunately it seems like the \ba r commads provides a slightly thicker bar which is why I am wondering if there is ...
In the LyX GUI this is done via the Insert Delimiter button on the math toolbar: Set the left delimiter to None, and the right to |. Uncheck Keep matched, and let the Size be set to Variable: In LyX this looks like as below (left). The dotted vertical line indicates an invisible delimiter (as \left. in Niels example).
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1. In the following example, I define a new environment +bmatrix using the new LaTeX3 package tabularray. You can also adjust the rowsep in the optional argument. \documentclass{article} \usepackage{amsmath} \usepackage{tabularray} \usepackage{environ} \NewEnviron{+bmatrix}[1][2pt]{%.
The slanting makes the correct length of the bar a little more complicate. The following example measures the width of an upright X and uses this for the length of the bar. The solution also works for different math styles: \mathpalette\@Xbar{}%. % #1: math style. % #2: unused (empty) \sbox0{$#1\mathrm{X}\m@th$}%. \sbox2{$#1X\m@th$}%.
Code. \underbar switches to text mode since it boxes its contents. You can use \underline instead. \bar is declared as a maths accent by LaTeX whereas \underbar is a regular text command. fontmath.ltx contains \DeclareMathAccent{\bar}{\mathalpha}{operators}{"16} whereas latex.ltx includes \def\underbar#1{\underline{\sbox\tw@{#1}\dp\tw@\z@\box ...