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15
Math.TechQA.Club
2026-03-25 11:18:45
816
Views
Are there any simply connected parallelizable 4-manifolds?
Published on
25 Mar 2026 - 11:18
#differential-geometry
#algebraic-topology
#vector-bundles
#4-manifolds
258
Views
Kirby diagrams for nonorientable $4$-manifolds
Published on
27 Apr 2026 - 5:13
#manifolds
#differential-topology
#geometric-topology
#kirby-diagram
#4-manifolds
198
Views
Is there a lower bound on the Euler characteristic of a four-manifold with given fundamental group?
Published on
24 Apr 2026 - 3:02
#differential-topology
#geometric-topology
#4-manifolds
143
Views
branched cover over slice disk is a rational ball
Published on
21 Apr 2026 - 23:15
#algebraic-topology
#covering-spaces
#4-manifolds
111
Views
An orientable 4-manifold with completely nontrivial 2-type
Published on
25 Mar 2026 - 10:52
#differential-topology
#homotopy-theory
#fundamental-groups
#4-manifolds
#higher-homotopy-groups
394
Views
Morse functions on 4-manifolds
Published on
25 Mar 2026 - 11:18
#geometric-topology
#morse-theory
#4-manifolds
33
Views
Is there a known topological space homeomorphic to $(M\times M)/\Bbb Z_2$?
Published on
25 Mar 2026 - 11:23
#general-topology
#4-manifolds
158
Views
Can you construct a hypersphere with a curvature of zero?
Published on
25 Mar 2026 - 11:20
#geometry
#curvature
#4-manifolds
157
Views
What is the metric of a surface defined by $0=\phi^2 t^4-x^2-y^2-z^2$?
Published on
25 Mar 2026 - 11:21
#differential-geometry
#manifolds
#4-manifolds
386
Views
non-orientable 4-manifolds
Published on
12 Apr 2026 - 7:30
#reference-request
#differential-topology
#4-manifolds
573
Views
4-Manifolds of which there exist no Kirby diagrams
Published on
10 May 2026 - 14:32
#geometry
#differential-topology
#low-dimensional-topology
#kirby-diagram
#4-manifolds
82
Views
Proof explanation: every 2-sphere in the boundary of a 4-dim handlebody bounds a 3-ball
Published on
25 Mar 2026 - 11:21
#general-topology
#differential-geometry
#geometric-topology
#4-manifolds
155
Views
How many angles it's needed to define 2-plane in 4d?
Published on
25 Mar 2026 - 11:18
#plane-geometry
#4-manifolds
194
Views
How do I calculate the circumference of a n-sphere?
Published on
25 Mar 2026 - 11:20
#geometry
#spheres
#4-manifolds
172
Views
Proof of the Extended Reeb's Theorem for dimensions less than 7
Published on
25 Mar 2026 - 11:20
#smooth-manifolds
#morse-theory
#4-manifolds
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