I can't figure out how to enter a few simple things with the latex-based unicode entry system.
I can get a variable with name $x_t$ by entering x\_t-tab, but when I try
to get an $x_b$ by entering x\_b-tab, it expands to x\_beta.
And I can't figure out how to do multi-character subscripts, like $R_{jk}$
or $\sum_{k=j+1}^m$ (the latter is for a comment about a sum computed in a
loop).
Extra credit for guessing the numerical algorithm associated with the
multi-character subscripts.
John
