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May 16, 2023 at 13:19 history edited David E Speyer CC BY-SA 4.0
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May 5, 2023 at 5:44 comment added Mathews Boban Yes, I only wanted entries in $[-1,1]$. I did not know of any other matrix apart from the Hadamard matrix, with entries in $[-1,1]^n$, that satisfy the criterion in the question (for $n$ infinitely often). Great answer!
May 5, 2023 at 5:41 vote accept Mathews Boban
May 4, 2023 at 15:53 history answered David E Speyer CC BY-SA 4.0