Portfolio Variance solution not accepted #40
Description
I don't understand why my answer isn't being accepted, can't see any difference in the shadow.
Using Firefox on Windows 10
I also had a similar issue earlier with the quaternion identity, but I boiled that one down to \mathbf{i}\mathbf{j}\mathbf{k} being accepted, while \mathbf{ijk} was rejected (both produced identical output as far as I could see).