Results 1 to 2 of 2

Math Help - correcting an isbn number (maybe with hamming code?)

  1. #1
    Member
    Joined
    Nov 2009
    Posts
    80

    correcting an isbn number (maybe with hamming code?)

    correct an error in the isbn number 0-316-37388-X-9 with 11-th check digit congruent to (the sum of the digits in positions 1-9)(mod 11).

    note that X=10

    This feels like it deals with the hamming code, but I don't even know where to start.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Oct 2009
    Posts
    5,561
    Thanks
    785
    Just look at the back of your textbook

    Seriously, I don't understand a couple of things.
    correct an error in the isbn number 0-316-37388-X-9
    Why does this number have 11 digits? Wikipedia says that ISBN number must have either 10 or 13 digits.

    with 11-th check digit congruent to (the sum of the digits in positions 1-9)(mod 11).
    So, the 10th digit is completely unused? Also, according to Wikipedia, the last digit is congruent not to the sum, but to the weighted sum, where the ith digit ( i=1,2,\dots,9) is multiplied by i.

    note that X=10
    And X is not a variable; it is a digit similar to A in hexadecimal. Again, Wikipedia agrees that the 10th digit, unlike the first nine, must range from 0 to 10 (written as X), but it should be the last digit.

    So, are you dealing with some variant of ISBN that is specifically adapted to your course? Could it be that you don't know where to start because you don't know the definitions?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. The [5,2] error correcting code
    Posted in the Number Theory Forum
    Replies: 3
    Last Post: July 25th 2010, 09:03 AM
  2. Hamming Code, Parity Matrix
    Posted in the Number Theory Forum
    Replies: 1
    Last Post: May 28th 2010, 06:03 AM
  3. error correcting code
    Posted in the Advanced Math Topics Forum
    Replies: 5
    Last Post: February 19th 2010, 03:37 AM
  4. Error Correcting Code
    Posted in the Advanced Math Topics Forum
    Replies: 0
    Last Post: January 25th 2010, 08:44 PM
  5. [SOLVED] don't understand the hamming code
    Posted in the Number Theory Forum
    Replies: 1
    Last Post: December 3rd 2009, 07:39 AM

Search Tags


/mathhelpforum @mathhelpforum