Joint with Bob Gompf and
John D. McCarthy
On fundamental groups of quotient spaces, Topology and its Applications, Vol. 159, 2012, 322-330.
Old
Version
Quotient Maps with Connected Fibers and the Fundamental Group (arXiv version from 4/24/2009)
Contains detailed proofs for our original examples; lacks historical references, simplicial observations, and some newer examples.
Additional
Items
Proof (using nets) that f:X->Y proper with Y locally compact and Hausdorff implies f is closed (JC, c. 1/2010?)
.
Vietoris_1927 (see equations (7), (8b), and also (5))