Definition:International Standard Book Number/ISBN-13
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Definition
An International Standard Book Number is a codeword used to uniquely identify a published book.
The ISBN-$13$ format consists of a string of $12$ digits followed by a check digit.
The check digit $d$ is calculated as:
- $d = \ds \sum_{k \mathop = 1}^{12} k d_k \pmod {10}$
Also known as
An International Standard Book Number is usually referred to by its abbreviation ISBN.
Also see
- Results about International Standard Book Numbers can be found here.
Linguistic Note
When referring to an International Standard Book Number by its abbreviation ISBN, beware not to vocalise it as "ISBN number".
The word number is already included in the abbreviation ISBN, so does not need to be repeated.