Why did you place an en dash before the one? Are you ending with one without knowing where you began?
it's acceptable for general usage i suppose, but the en dash is closer to what a real minus/negative sign looks like.
While that might be true for print, I think it's pretty understood that the hypen is the commonly used character in computing. However, a true minus (−1) does look better than either a hypen (-1) or an en dash (–1).
I assume you used html for the minus. i don't have that memorized for internet commenting.
Not HTML, but Unicode. It's in the "Special Characters..." dialog, which is ⌥⌘T in most Mac applications.
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