Improve appearance of true and false. #748
Merged
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In LaTeX's math mode, multi-letter items like true and false should be enclosed
in \mathit{...}, otherwise, each letter is considered a separate item and the
multi-letter item is rendered as an arithmetic product of its letters, with a
bit of additional spacing between the letters.
This commit adds \mathit{...} around all the math-mode occurrences of true and
false.
For example, this changes
![old-true-false](https://user-images.githubusercontent.com/2409151/57258486-6901ee80-7011-11e9-8e98-b8d326e01539.png)
![new-true-false](https://user-images.githubusercontent.com/2409151/57258492-6ef7cf80-7011-11e9-9a29-0387314ff700.png)
to
(note the spacing between the letters).
Unless there are objections, I'll merge this in a few days.