\dots versus \ldots - is there a difference?

Is there a difference between \dots and \ldots, the ellipsis?

If yes: Which? When to use \dots and when to use \ldots?

If no: Why are there both at all?

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\dots is magic! ... when using amsmath ;-) –  Juan A. Navarro Oct 17 '12 at 9:59
A great answer is here –  moose Oct 19 '12 at 18:18

in latex.ltx, \ldots is equated (\let) to \dots. so in text, it's the same, and you can use either.
with amsmath, the situation is more complicated; \dots tries to determine by context (only in math mode) whether to use \ldots or \cdots, with several more options for the author if amsmath doesn't get it right.
so in general, it's easier to just use \dots and not have to remember the details.
@FooBar texdoc source2e is a good starting point :) –  cmhughes Oct 15 '12 at 16:16