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Aug 19, 2023 at 0:41 comment added user130609 @FedericoPoloni My bad, the original post asked for $f(k*u)$ before edits. Finding $k*f(u)$ would be interesting.
Aug 17, 2023 at 22:38 comment added Federico Poloni Isn't this $f(k*u)$, rather than $k * f(u)$ as OP asked?
Aug 17, 2023 at 22:28 history edited user130609 CC BY-SA 4.0
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Jun 30, 2023 at 18:32 history edited user130609 CC BY-SA 4.0
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Jun 24, 2022 at 11:09 comment added Ilmari Karonen Another option would be $k = \left[ \begin{array}{} 2 & 2 & 2 \\ 2 & 1 & 2 \\ 2 & 2 & 2 \end{array} \right]$ with $f(u) = 1$ iff $5 \le u \le 7$.
Jun 22, 2022 at 18:39 history edited user130609 CC BY-SA 4.0
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Jun 22, 2022 at 18:30 history edited user130609 CC BY-SA 4.0
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S Jun 22, 2022 at 18:24 review First answers
Jun 22, 2022 at 19:17
S Jun 22, 2022 at 18:24 history answered user130609 CC BY-SA 4.0