Is there support for a sticky thread answering commonly asked questions? I am specifically thinking of the 0/0, infinity/infinity, what is infinity, 0.999..=/=1 questions that come up far too often. I am not suggesting this thread becomes it, nor that I should write it. If anyone wants to add a suggestion for a *general* topic please feel free, but please don't post disputing the fact that 0.999...=1 is true. I'd be happy to write one, but don't think I'm the best person to do so. Ideally it should simply explain why these are mathematical truths, not offer opinions on the "real world implication" of what it means to, say, divide infinity by infinity. I mean, the fact that 0.999 ..=1 cannot be in dispute, and the answer should simply explain what the mathematical ideas behind this are; it should not attempt to rebuff the crankish views on these subjects since they are often not mathematical. It should instead address people asking genuine mathematically based questions about why this is true, or that isn't a valid operation. I'd suggest that the final thread, if there were one, should be locked. Any pros cons I've not mentioned and so on?