This image is a derivative work of the following images: File:AdditionRules.svg licensed with Cc-by-sa-3.0,2.5,2.0,1.0, GFDL 2007-12-13T02:19:28Z Ezra...
numbers Date 12 December 2007 Source Own work Author Ezra Katz Other versions Derivative works of this file: AdditionRules-2.svg SignsRuleCoulomb.svg...
