Why do they print the number of Illustrations on some mathematics books? For example:
In my whole life, I've seen this only on maths books and I can't figure out why they do this or why it's important.
closed as off topic by Pedro Tamaroff, William, Aang, Jasper Loy, Hans Lundmark Sep 27 '12 at 18:30
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I guess this is only tradition. At some point in time it was huge work and very costly to make and print figures, so at that point in time it was a selling point.