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It's impressive that people will suffer the agony of trying to read a book in PDF form for the sake of getting it for free.

After discovering the EPUB/MOBI formats and the joy of having text dynamically scale on my phone/tablet, it's very difficult to go back trying to read an extensive document in PDF. On anything but a PC it just feels archaic.

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EPUB/MOBI is good for prose.

On the other hand, as of today, technical documents, scientific articles, anything with nontrivial illustrations/typesetting has to be displayed in PDF to avoid unexpected results. Maybe we'll see changes in this regard, facilitated by the emerging interactive jupyter-like document formats, but PDF is here to stay for a while.

Sure, but if you've got an ebook reader(which usually means 6-7 inch screen size) you don't want to use PDF unless it's absolutely necessary.

She calls it PDF but maybe she just means any ebook format.

Also PDF can be text (instead of scanned pictures, etc) and can easily be converted to any other text format, from EPUB to TXT.

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