Hello, I'm Tsirel. I noticed that you made one or more changes to an article, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so! If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you.
Please do not add or change content without citing a reliable source. Please review the guidelines at Wikipedia:Citing sources and take this opportunity to add references to the article. Thank you.
You did the same a number of times, under several IP numbers: 196.224.17.232, 197.28.160.228, 197.28.165.239, 196.224.0.104 on several articles: Heisenberg picture, Schrödinger picture, Quantum state, Vector space, Correlation function (quantum field theory), Quantum Hall transitions, Path-ordering, and were warned twice (see User talk:196.224.0.104). Now you do it on Path-ordering again. Your source (Richard Feynman in Volume I Section 39-3 "compressibility of radiation"; see [1]) does not support your claim. Please stop!
Please stop adding unsourced content. This violates Wikipedia's policy on verifiability. If you continue to do so, you may be blocked from editing Wikipedia.
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