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WingedViper comments on Rationality Quotes October 2012 - Less Wrong
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You have an inequality symbol missing at the end of the quote (between i and j). That made it slightly difficult for me to parse it on my first read-through ("Why does it say 'for all i, j' when the only index in the expression is 'i'?").
I don't know if you know, but just in case you (or someone else) don't: There is no inequality symbol on the computer keyboard, so he used a typical programmer's inequality symbol which is "!=". So yes, it is not easily readable (i! is a bad combination...) but totally correct.
The symbol wasn't there when I wrote my comment. It was edited in afterwards.
The way to handle that is whitespace:
i != 0. (I once was teased by my tendency to put whitespace in computer code around all operators which would be spaced in typeset mathematical formulas.)EDIT: I also use italics for variables, boldface for vectors, etc. when handwriting. Whenever I get a new pen I immediately check whether it's practical to do boldface with it.
A space between variable & operator would help.