NMSU • BLAST-2009

**Something Old, Something New, Something Borrowed, ...**

F.E.J. Linton • Wesleyan Univ. Math/CS Emeritus

F.E.J. Linton • Wesleyan Univ. Math/CS Emeritus

Billed to the organisers as “a short talk about a peculiar topological space that Peter Johnstone, Bob Paré and I used some 30 years ago to solve a topoidal problem.”

“Peculiar” | It has a discrete, dense, open subset, whose (closed) complement is a discrete subspace as well, yet ... |