@amWhy He edited the newer version to explain that it's not a duplicate but a generalization. I'm not sure how much benefit having such a question and answer will provide to future readers, though, since it is trivial once one has a rudimentary understanding of double-counting.
@amWhy <− The asker here is in the habit of posting PSQs.
@Did @amWhy @ZacharySelk: This answer is wrong (as stated in my comments) and the author has twice refused to correct it. Like how many minutes would it take to just remove unjustified claims?
@DanielFischer Not trying to bug you, but given the weekend, I could hope for some resolution re my four downvotes yesterday +more on Monday, maybe Tuesday?
Oops, @DanielFischer Sorry I commented here; (silly me thought I was in the math mod office chatroom! :Z
@amWhy I don't know. I'd prefer to not burden the CMs with too much digging, they have enough to do already. So I'd wait a couple of days to see whether something turns up in the stuff we can see before pushing it over.
Has there been uptake in other languages, of the English very well used slang: "No problem"? It kind of reminds me of the Spanish "de nada" (it's nothing).
@amWhy My keyboard doesn't have Cyrillic characters, too complicated. Not sure about the uptake of "No problem" all around the world. In French, "pas de probleme" (there ought to be an accent there, but I'm too lazy), and in German "kein Problem" have been around since - well, at least since I know. But in geological terms, that's just a tiny fraction of a moment.
You're luckier than I, @DanielFischer; my keyboard is "English only" so I can't even type in an accent! I've looked for a computer keyboard that's more Universal, but I've learned it is available only via online ordering. But I suspect using a more multi-lingual keyboard may slow down typing a bit.