File:Addition of integers using Grothendieck construction.svg

This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Commons is a freely licensed media file repository. You can help.

Summary

Description	English: A depiction of the sum (−2) + 1 = (−1) using the Grothendieck group construction of integers as equivalence classes of pairs of natural numbers. Representing −2 = <2, 4> and 1 = <3, 2>, we have −2 + 1 = <2, 4> + <3, 2> = <5, 6> = −1.
Date	9 September 2012, 17:10:50
Source	Own work
Author	Melchoir

Licensing

I, the copyright holder of this work, hereby publish it under the following license:

This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.

You are free:

to share – to copy, distribute and transmit the work
to remix – to adapt the work

Under the following conditions:

attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.

CC-BY-SA-3.0 truetrue

File usage

The following pages on Schools Wikipedia link to this image (list may be incomplete):

Addition

Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.

Width	138
Height	282

More information

Through Schools Wikipedia, SOS Childrens Villages has brought learning to children around the world. SOS Children's Villages is a global charity founded in 1949 to give children who have lost everything the childhood they deserve. Have you heard about child sponsorship? Learn more...