1 problem

Sturmian-region conjectures. (i) If $-4\leq r-s\leq3$, then, except for $(r,s)=(4,1)$, $w_{r,s}$ is Sturmian. (ii) If $r-s=4$, then $w_{r,s}$ is Sturmian if and only if $r$ is even…