The set of points not removed at any step is precisely the set of points belonging to A(n) for each n. So, the Cantor setThe Cantor set = the points not removed at any step.

It is tempting to put

The Cantor set = the intersection of all A(n), but this would cause problemsisthe intersection of all A(n).

You defined not a single real number p, but a sequence , so instead of , you have for all n.I concentrate on p = (the number corresponding to) the right end-point of the left-most interval of the Cantor set.

Most math and other special symbols are entered using backslash-commands, such as \alpha, \sum, \int, \forall. Subscripts and superscripts are entered as follows: a_n and a^n. You can click "Reply with Quote" button under someone's response to see how they entered it. See the sticky LaTeX tutorial thread in the LaTeX help forum.Where do I differentiate between, say, subscript, superscript, Greek letters, quantifiers, and so forth?