Elastic elements in 3-connected matroids

George Drummond, Zachary Gershkoff, Susan Jowett +2

It follows by Bixby's Lemma that if $e$ is an element of a $3$-connected matroid $M$, then either ${\rm co}(M\delete e)$, the cosimplification of $M\delete e$, or $\mathrm{si}(M/e)$,…