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Images are useful if you are authoring a math heavy document (and don't want to go back and forth between a previewer and the editor).

See http://www.gnu.org/software/auctex/img/preview-screenshot.pn... for an example.

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Well, I would use another — more suited — tool than a text editor for that kind of task. A word processor, for example.

I guess this is a difference in philosophy. I prefer to use a te t editor for editing all types of text: code, emails, tex markup, HTML markup, etc. Hence, for me, a text editor is better than a word processor. But I do like the convenience of not having to go back and forth between a previewer (PDF reader) and the text editor, and therefore like the fact that emacs allows embedding of imaging. (Not to mention the fact that none of the word processors can beat TeX output in terms of quality and flexibility)

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