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Oct 3, 2021 at 17:46 comment added Sky So @Chris that means you want to say when the intersection of the image with $L_3$ is $\phi $
Oct 3, 2021 at 9:42 comment added Chris Wuthrich You know all the ways $z\in L_3$ can be written as $b/c-1$ with $b$ and $c$ in $L_3$. So the question seems to be the intersection of $L_3$ with the image of $a\mapsto \sigma^2(a)/a$ from $L^\times$ to itself.
Oct 3, 2021 at 9:07 history edited YCor CC BY-SA 4.0
changed tags, formatting
Oct 3, 2021 at 8:27 history asked Sky CC BY-SA 4.0