To get the symbol "aleph null" typically used to denote the cardinality
of the set of natural numbers, I can simply type the eight keystrokes
\aleph_0 and it will show up in LyX correctly.
Now suppose I want the set whose members are all countable subsets of
the real numbers. This is typically denoted as R_\aleph_0 (where by "R"
I don't mean the ordinary letter capital R, I mean the symbol
$\mathbb{R}$ that is used to denote the set of real numbers, which I can
get in math mode from the "del" (inverted triangle) menu. In other
words, it's "R" with subscript "aleph null".
Here's the part I don't understand. If I put in the "R" followed by
_\aleph_0, the R and the aleph show up correctly, but the zero (the
subscript of the aleph) shows up as a different character (I think it's
the character that's used in formal logic to mean something like "is not
a proof of").
Could someone please explain to me what is going on here? I can't make
any sense out of it.
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