Talk:Check digit

message: St{ill to be added is a discussion of the Verhoeff check {{WikiProject banner shell|class=Start|
digit scheme.
See the marist.edu link.
16:06, 7 February 2006 (UTC)
thread_title: Untitled

message: I'm sorry that I do not have time to correct this page, but there are several major errors:
In the ISBN example the weights are applied from the left most digit, starting with a weight of 1.  Weights should be applied from the RIGHTMOST digit, starting with a weight of 2.  This is because the check digit actually assumes a weight of 1, and is in fact the complement of the modulo 11 arithmetic remainder (i.e. 134 modulo 11 = 12 R 1, so the check digit is 11 - 2 = 9).  When the ISBN code is checked for integrity the whole code, including the check digit, is used in the calculation and will produce an answer of 0 if valid.
The algorithm at the bottom of the article does not work, unfortunately I csnnot immediately see what it should be. —The preceding unsigned comment was added by 210.3.39.30 (talk) 02:46, 15 February 2007 (UTC)
thread_title:  This page contains errors 

message: Is this the same as a control number?
Not completly, I think a control number can be a more complex than just a check digit. See here: http://glossary.ippaper.com/default.asp?req=knowledge/article/211
Gs1mo 21:00, 16 May 2007 (UTC)
thread_title:  Control number 

message: International Bank Account Numbers also contain check digits?
UK VAT numbers also have check numbers and this can be a way of cehcikng the bone fides of a company, perhaps someone who knows it could add it here?85.234.151.89 (talk) 19:07, 19 December 2009 (UTC)
thread_title:  Another example of check digits 

message: Contemporary Abstract Algebra by Joseph Gallian, 5th edition, Houghton Mifflin, 2002, pp. 9-14.
"Modular Arithmetic in the Marketplace", by Joseph Gallian and Steven Winters, in The American Mathematical Monthly, Vol. 95, No. 6, 1988, pp. 548-551.
I don't see where these were being used in the article.
I added a reference to EAN-13 check digit computation to the article.  I also found a reference to the documentation for ISBN-10 check digit computation, but it is not public domain so I did not add this reference to the article at this time: http://www.lac-bac.gc.ca/iso/tc46sc9/2108.htm  Calebb (talk) 07:28, 22 May 2008 (UTC)
thread_title:  Orphaned References 

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thread_title:  External links modified 

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thread_title:  External links modified 

message: The link on coprime points to https://en.wikipedia.org/wiki/Http  — Preceding unsigned comment added by 137.92.159.143 (talk) 04:01, 10 July 2019 (UTC)
replies: text: . Thank you, it  has been fixed. --DavidCary (talk) 03:14, 17 February 2024 (UTC)
thread_title:  Error