Hello, Tshibli! Welcome to Wikipedia! Thank you for your contributions. You may benefit from following some of the links below, which will help you get the most out of Wikipedia. If you have any questions you can ask me on my talk page, or place {{helpme}} on your talk page and ask your question there. Please remember to sign your name on talk pages by clicking or by typing four tildes "~~~~"; this will automatically produce your name and the date. If you are already excited about Wikipedia, you might want to consider being "adopted" by a more experienced editor or joining a WikiProject to collaborate with others in creating and improving articles of your interest. Click here for a directory of all the WikiProjects. Finally, please do your best to always fill in the edit summary field when making edits to pages. Happy editing! I dream of horsesIf you reply here, please leave me a {{Talkback}} message on my talk page. @ 07:01, 21 October 2014 (UTC)[reply]
I notice that you copied some text word-for-word in this edit at least, like "The example we have just given of simplifying the calculation of matrix elements for a dipole transition is really an application of the Wigner-Eckart theorem, which we take up later in these notes" which is copied from Robert Littlejohn lecture notes. There are two problems with this. First, you didn't put the text in quotation marks and cite the source so it's plagiarism. (The source is cited and linked somewhere on the page, but that's not good enough, the copied text itself has to be in quotes with a link right there next to it.) Second, even if you added the source, there would still be a problem: The text is copyrighted by the author (as always), so it's illegal to post it on wikipedia. (If you had quotation marks around the text, it might be OK ("fair use"). But much better to use your own words.)
