Latex Bar

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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. What would be my best choice?
3Sphere
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lockstep
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See also this answer of mine for a \widebar command that produces a bar wider than \bar and smaller than \overline. – Hendrik Vogt May 13 '13 at 12:25
Here is a command \xoverline[width percent]{symb} that will do it. Note that it will not scale inside sub or superscripts. If you need that, everthing has to go through a \mathchoice resulting in a lot more complex code.
Danie Els
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Someone should do the \mathchoice thing and package this into a package! – Mariano Suárez-Álvarez Jun 27 '14 at 5:38
I usually define a command \overbar, which reduced the width of \overline by 1.5mu on each side.
Michael Ummels
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Would this solution have the same issues regarding subscripts/superscripts as described in Danie's solution? – Tony Mottaz Jan 24 '16 at 21:48
@Anthony I believe not, it doesn’t go out of math mode and thus stays in the style it was invoked in. – Alex Shpilkin Aug 1 '16 at 21:33
Great command, makes the bar look identical to an excerpt from Understanding Analysis by Stephen Abbott (although \overline might still be a good alternative). – Joshua Detwiler Oct 12 '17 at 20:26
I need a bit shorter overlines for variables in boolean algebra to make clear that variables are separately inverted. I defined the following command:
It is special designed for variables that are typeset in italic, so it is not only above but rather above right. So upright characters need a different definition:
Similar definitions for underlines:
Thomas Ihme
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It took me a while to get a command that puts a nice overline over any field name, independent if its the reals, rationals, a finite field, or just a single literal. Based on this and that, I wrote the command \closure that uses \olsi for the overline if the argument is just a single literal, and \ols otherwise. The following table gives a comparison of these commands.
As a small bonus it also does not require any additional packages to be loaded.
j-danner
j-danner 11●11 bronze badge
I'm not a Latex expert, but I've made a code that allows you to control the length and position of the top bar in another answer. Maybe that helps someone.
See the complete answer to see all the examples and drawbacks.
If you are planning to use this command more often for a specific mathematical expression, you can use the following code to make things cleaner.
Leone
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