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.
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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. |
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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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