This version gives more details on the weight argument used in Section 1; the new Lemma 2 fills an implicit gap in the initial proof of Proposition 2.
The Brauer group of $\mathscr{M}_{1,1}$ over algebraically closed fields of characteristic $2$
The images of Lie polynomials evaluated on $2\times 2$ matrices over an algebraically closed field
The Brauer Group of an Affine Double Plane Associated to a Hyperelliptic Curve
![QR code for arXiv:1401.0791 [math.AG]](http://oss.arxitics.com/images/favicon.svg)