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May 10, 2019 at 1:09 history edited Noah Schweber CC BY-SA 4.0
added 35 characters in body
May 9, 2019 at 23:25 comment added Ruy Thanks, Noah. Changing the perspective really made my question trivial!
May 9, 2019 at 23:24 vote accept Ruy
May 9, 2019 at 22:56 comment added Andreas Blass Your definition $f_k(i)=b_i(k)$ reminds me that Attila Máté once told a class in combinatorial set theory that the main technique of that subject is interchanging the subscript and the argument.
May 9, 2019 at 22:37 history answered Noah Schweber CC BY-SA 4.0