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Why do they print the number of Illustrations on some mathematics books? For example:

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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.

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closed as off topic by Pedro Tamaroff, William, Aang, Jasper Loy, Hans Lundmark Sep 27 '12 at 18:30

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Sorry if the tag is not plausible, but I couldn't find a better tag. –  Vladimir Putin Sep 26 '12 at 16:28
My guess is that it's a selling point. –  Joe Johnson 126 Sep 26 '12 at 16:41
Some people like pictures, such as fans of Oliver Byrne's edition of Euclid. –  Henry Sep 26 '12 at 16:43
It's not just math books. Books on many topics will have in the front matter a statement of the number of figures or illustrations. –  Michael Hardy Sep 26 '12 at 17:25
Why do you think it is restricted to math books? In my experience there is no such restriction. E.g. searching Google Books for with 22 illustrations yields over $37000$ books on many subjects, most not mathematics. –  Bill Dubuque Sep 26 '12 at 17:57
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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.

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