About black triangles, if someone wants to use or just click on the image
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Now watch
Really cool, isn't it? I made it with MathType. To generate the cross line, you gotta put {\rlap/}. See the code above.
I had made up this way to cancel fractions . . .
. . . . . \frac {\not4 ^2} {\not6 _3} = \frac{2}{3}
But I really like your "rlap" code . . . it's looks much better!
. . . . \frac{\rlap/4 ^2} { \rlap/6 _3}
Let me try something: . frac{1{\rlap/9}} {{\rlap/9}5} = \frac{1}{5}
. . . . . . . Ha! It works!
the thing is, i could not make the strike through go through two symbols, for instance, if you wanted to strike through (cancel) 19, you'd have to do one strike for the 1 and one for the 9. does anyone know how to go through two or more symbols at a time, or am i just being too picky?
I was just browsing around and found some interesting information on this. I saw an example where x - x was canceled out by a diagonal line and had a 0 in the upper right corner.
I couldn't find code for it, but the article mentioned using the "cancel package." So.......
@MathGuru: Do we have the cancel package loaded into the site?
-Dan