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Dec 24, 2016 at 7:18 comment added Nemo There is a relation for values of $ℓ$ apart from 1 and 2
Nov 27, 2016 at 22:38 vote accept Andreas Rüdinger
Dec 30, 2016 at 13:12
Nov 27, 2016 at 21:19 comment added Andreas Rüdinger Many thanks. That's very nice. (I will wait for other answers, but will probably accept your answer.)
Nov 27, 2016 at 21:01 history answered Lucia CC BY-SA 3.0