19 citations · 19 across the 3 of their papers we have counts for
3 papers
math.GT2014★ 19 cited
Some 3-manifold groups with the same finite quotients
John Hempel
We give examples of closed, oriented 3-manifolds whose fundamental groups are not isomorphic, but yet have the same sets of finite quotient groups; hence the same profinite complet…
math.GT1999
Positive diagrams for Seifert fibered spaces
John Hempel
A Heegaard diagram for a 3-manifold M is a closed, oriented surface S together with a pair (X, Y) of compact 1-manifolds in S whose components serve as attaching curves for the 2-h…
math.GT1997
3-manifolds as viewed from the curve complex
John Hempel
A Heegaard diagram for a 3-manifold is regarded as a pair of simplexes in the complex of curves on a surface and a Heegaard splitting as a pair of subcomplexes generated by the equ…