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I think 7.8" is still too small for technical/academic PDF. E-ink, in particular, is too slow to refresh and e-ink reader hardware is too under powered, making zooming and panning a painful slog. Therefore, you want 9.7" or even bigger, so that you need only to crop margins and almost never pan or zoom. In other words, you want to use it as digital print. That's what e-ink is best for.
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