The following looks nice on each of several Mac browsers:
<br>G<sub>&mu;&nu;</sub> = 8&pi; T<sub>&mu;&nu;</sub>
<br>
G<sub>μν</sub> = 8π T<sub>μν</sub>
<p>But the following is ugly to produce and ugly to view.
<table>
<tr><td><table>
<tr><td><font size=+3>∫</font>T dV<td>
<tr><td>V,t=t<sub>0</sub></table>
<td> −
<td><table>
<tr><td><font size=+3>∫</font>T dV<td>
<tr><td>V,t=t<sub>1</sub></table>
<td> =
<td><table>
<tr><td>t=t<sub>1</sub>
<tr><td><font size=+3>∫</font>T dt dS<td>
<tr><td>t=t<sub>0</sub></table>
</table>
<p>This came from <a href=http://www.math.ucr.edu/home/baez/physics/Relativity/GR/energy_gr.html>Baez’</a>:
<pre>                                               t=t1
       /                  /                    /
       |                  |                    |
       | T dV     -       | T dV       =       | T dt dS
       /                  /                    /
     V,t=t0             V,t=t1                 t=t0
</pre>
Incidentally I have a very low opinion of math-ml as seen either by the author or the reader.
I am not on the sgml bandwagon.