This note comments on a paper of G. McMurdo concerning two ISBN-checking algorithms. It is shown in a trivial way that both algorithms are exactly the same in all cases. So there was no need to check 2000 ISBN-numbers by computer as did McMurdo.
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References
1.
G. McMurdo, An alternative ISBN checking algorithm, Journal of Information Science3 ( 1981) 235-237.
2.
L.A. Tedd, An introduction to computerbased library systems (Heyden , London, 1977).
