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Originally Posted by Dave Berk
1. What's the best pdf app for reading technical books, heavy with math and code?
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I don't read PDF books myself, but the consensus appears to be that "Goodreader" is about the best PDF reading app.
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2. For epub books, does the iBooks app have support for dictionaries? Does it cost more to add dictionaries? Any built-in?
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iBooks has a pretty good English dictionary built in.
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4. Does Calibre works well with iPad as a device or only with the iBooks app (is there a difference?)
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Calibre only supports the iBooks App (via iTunes). Yes, it works well.