slimvirgin@gmail.com wrote
Tony, [[Wikipedia:Cite sources]] may only be a guideline, but it's inextricably linked to [[Wikipedia:No original research]], which is policy, because the only way you can show that an edit isn't original research is to produce a reputable source.
Doesn't that get back to over-interpreting 'original research'? Which was discussed at length here, a while ago. I distrust statements of this kind, on principle. Anyway it is a poor description of what goes on. A one-line deduction from known facts is obviously not 'original research', whether or not you can cite someone else having already done it. Such things are the small change of doing the research for an article. (Obviously if I read that A is the son of B, I deduce that B is the parent of A; put a few such trivial moves together and you get conclusions which are possibly novel.)
Charles