How to change the position of underset?

Question

In the command:

\underset{t \rightarrow x}{\limsup} f(t) = \underset{t \rightarrow x}{\liminf} f(t)

I get the {t \rightarrow x} lower under the limsup then the liminf (due to the "p" in limsup).

How can I change the position of the underset?

A tip: If you indent lines by 4 spaces, then they are marked as a code sample. You can also highlight the code and click the "code" button (with "101010" on it). — Caramdir, Mar 10 '11 at 19:18
Shouldn't that be written as \limsup_{t \rightarrow x} f(t) = \liminf_{t \rightarrow x} f(t)? Doesn't solve the problem though. — Caramdir, Mar 10 '11 at 19:23
I tried that first, but it placed the {t \rightarrow x} to the right of limsup. — milcak, Mar 10 '11 at 19:24
That is usually by design in inline mode. You can override that behavior with \limsup\limits_{t \rightarrow x} f(t). — Caramdir, Mar 10 '11 at 19:27
Very much related: Supremum of the infimum (possible duplicate). — Hendrik Vogt, Mar 11 '11 at 07:45
@Hendrik: the mathtools solution in the linked question doesn't work in this case though (the other solution works of course) — Caramdir, Mar 11 '11 at 17:59
@Caramdir: Ah, OK, thanks, so not a duplicate since the mathops are not adjacent. — Hendrik Vogt, Mar 11 '11 at 18:03

score 4 · Accepted Answer · answered Mar 10 '11 at 19:14

4

A phantom could be useful:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\[
  \underset{t \rightarrow x}{\limsup} f(t) = \underset{t \rightarrow x}{\liminf\vphantom{p}} f(t)
\]

\end{document}

answered Mar 10 '11 at 19:14

Gonzalo Medina

505,128

Yes that works thank you! Is there a general way of adjusting the position though? – milcak Mar 10 '11 at 19:17
you can also use a \mathstrut in lieu of the phantom, nothing wrong with your solution either. – yannisl Mar 10 '11 at 19:22
How does the \mathstrut work? – milcak Mar 10 '11 at 19:23
@Yiannis: yes. That will also work. – Gonzalo Medina Mar 10 '11 at 19:30

How to change the position of underset?

1 Answers1