This section on elliptic curves in fields of char=2.
1. difficult - the section was pretty straightforward for me. The one thing that tripped me up was in defining GF(4), we used $\omega$, which usually is the third root of unity in the complex plane. However, we had $\omega^2 = 1 + \omega$, which is not true in complex numbers. This is resolved by letting the coefficients of $\omega$ be in Z/2Z. Or just by ignoring the complex number part of it.
2. interesting - I'm really liking the group theory aspect of this part of class. The quick proof of $\omega^3 = 1$ in the book was fun.
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