This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionCheck digit TA quasigroup dhmd111rr illustration eg5724.svg
English: A Graphical Illustration of the Damm Check Digit Algorithm.
It is a check digit algorithm that detects all single digit errors and all adjacent transposition errors. It was presented by H. Michael Damm in 2004. Its essential part is a quasigroup of order 10 with the special feature of being weak totally anti-symmetric.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighbouring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
This file contains additional information, probably added from the digital camera or scanner used to create or digitise it.
If the file has been modified from its original state, some details may not fully reflect the modified file.
Short title
Damm check digit
Image title
A Graphical Illustration of the Damm Check Digit Algorithm.
It is a check digit algorithm that detects
all single digit errors and all adjacent transposition errors.
It was presented by H. Michael Damm in 2004.
Its essential part is a quasigroup of order 10 with
the special feature of being weak totally anti-symmetric.