Computation of extension spaces for the path algebra of type $\tilde{A}(n-1,1)$ using planar curves

Heather Anna Werth

$Q$ is a quiver of type $\tilde{A}(n-1,1)$ if its graph is of affine type ${\tilde{A}}_{n-1}$ and if its arrows have a certain orientation. We develop a bijection between the set of in…