New York City Category Theory Seminar
Something Old, Something New, Something Borrowed, ...
F.E.J. Linton • Wesleyan Univ. Math/CS Emeritus
Begin with two triangles.
Topology as usual
except
for the southernmost vertices, whose smallish basic neighborhoods are “broken
V
s” ...
... and that’s the connected double cover of a single triangle, well known to admit
no
continuous global section.
Key proof ingredient — connectedness.
F.E.J. Linton • Wesleyan Univ. Math/CS Emeritus
F.E.J. Linton • Wesleyan Univ. Math/CS Emeritus
Begin with two triangles.
