Can we find an example of non-Borel-measurable functions say $\phi_1$ and $\phi_2$ such that both $\phi_1+\phi_2$ and $\phi_1\phi_2$ are Borel measurable?
I can't think of any, appreciate any help!
2026-03-28 23:59:16.1774742356
Sum and product of two non-Borel measurable functions being Borel measurable
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