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states an ISBN is verified if the sum of the weighted digits modulo 11 is 0, but the weights are in reverse order: 10x(d1) + 9x(d2) + ... + 2x(d9) + 1x(d10), whereas this article states the opposite. Just for reference, the two are equivalent, since if you subtract 10x(d1) from one to the other you
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Certainly reprints in exactly the same format have the same ISBN, but I think the purists/legalists would like a new ISBN whenever a different looking cover goes on. In fact some books have been published by, for instance, Penguin, with the same ISBN for decades, and the covers certainly chaneg in
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get (-10)x(d1) which equals 1x(d1) since it's modulo 11. Then you subtract 9xd2 to get (-9)x(d2) which is 2x(d2) mod 11, etc. So the two approaches are the same, but it may be good to specify that in the article. --Joshua
Eckroth (josh@eckroth.net)
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retain the original ISBN, but haven't always. Until the late 1980s, US publishers of mass-market paperbacks would give their books new ISBNs whenever they reprinted them with higher prices, even though price was the only thing that changed.
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The article doesn't make clear (if it is indeed the case) that different editions have different ISBN numbers, but that reprints retain the original. Can someone confirm, please?
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I've always been under the impression that, in order to calculate if an ISBN is right, you should multiply the ten digits (including the check digit) from ten through one...
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Thanks for the "first-digit" correction. The ISBN site explains it nicely. The books I've had problems with are UK editions, in fact almost any that I've tried (see
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In some cases that seems to work, in others not, possibly because the publisher has (rather naughtily) assigned that number to another book later on.
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are working on getting a large public domain database from libraries, so far they have close to 1.9 million unique ISBNs. There is an
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10×0 + 9×3 + 8×0 + 7×6 + 6×4 + 5×0 + 4×6 + 3×1 + 2×5 = 0 + 6 + 0 + 24 + 20 + 0 + 42 + 8 + 45 = 130 = 13×11 + 2
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It would be useful to have information on the best sources of ISBN information for new and used books, worldwide.
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Of course the check digit would also be 2, in this case in particular -- but try it with another ISBN...
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Here's the calculation algorithm from ISBN.org, the official Bowker (US ISBN issuer) site about ISBNs:
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So, can you convert an SBN to an ISBN by simply prepending a 0, or is it more complicated than that?
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If you wish to start a new discussion or revive an old one, please do so on the
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Shouldn't be the word "monograph" used instead of "book" in the definition --
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So far as I know this only contains books *currently* listed on ABE. --
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Which, in the resolved formula, would be something like this:
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92:Jan 05- March 05 Archived now:
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