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general topology : Math Help
A finite set is open and closed in the same time.
general-topology
Updated April 25, 2018 04:20 AM
1
answers
28
views
0
votes
Which of these points in my set are limit points of that set?
general-topology
Updated April 25, 2018 03:20 AM
0
answers
3
views
0
votes
No metric on $\mathbb{Z}$ so complement of open sets are finite
general-topology
metric-spaces
set-theory
integers
Updated April 25, 2018 03:20 AM
0
answers
8
views
0
votes
Prove that if $X$ is Hausdorff, $\Delta$ is closed in $X\times X$
general-topology
Updated April 25, 2018 01:20 AM
0
answers
7
views
0
votes
Range space and homotopy
general-topology
algebraic-topology
Updated April 25, 2018 01:20 AM
2
answers
18
views
1
votes
Proof explanation for a step in Pollack that Normal Bundle is a manifold
differential-topology
proof-explanation
Updated April 25, 2018 00:20 AM
1
answers
12
views
0
votes
Is $R^4\setminus S^3$, with the subspace topology on $R^4$, connected?
general-topology
connectedness
Updated April 24, 2018 23:20 PM
0
answers
6
views
1
votes
Are countable sets meagre?
general-topology
descriptive-set-theory
Updated April 24, 2018 22:20 PM
1
answers
35
views
0
votes
How to give a differentiable structure to quotient of $\mathbb{R}P^{2}\times \mathbb{R}$?
differential-geometry
differential-topology
Updated April 24, 2018 22:20 PM
0
answers
8
views
0
votes
homology Euler class
differential-geometry
algebraic-topology
characteristic-classes
Updated April 24, 2018 22:20 PM
0
answers
19
views
2
votes
Function is open iff every element of a prebasis maps to open set
general-topology
elementary-set-theory
open-map
Updated April 24, 2018 22:20 PM
1
answers
12
views
0
votes
How to pullback a form
multivariable-calculus
differential-geometry
differential-topology
Updated April 24, 2018 21:20 PM
1
answers
21
views
2
votes
Locally convex inductive limit topology versus cofinal topology
general-topology
locally-convex-spaces
universal-property
Updated April 24, 2018 21:20 PM
0
answers
17
views
0
votes
Covers of a sphere with two points identified
algebraic-topology
Updated April 24, 2018 20:20 PM
1
answers
15
views
0
votes
Is X a cover of itself?
general-topology
Updated April 24, 2018 18:20 PM
1
answers
15
views
-1
votes
Density of continuous functions
real-analysis
general-topology
Updated April 24, 2018 18:20 PM
0
answers
17
views
0
votes
Norm preserving linear transformation preserves volumes
calculus
real-analysis
differential-geometry
manifolds
differential-topology
Updated April 24, 2018 16:20 PM
1
answers
59
views
1
votes
Is it possible to obtain the local defintion from the global definition, in Topology?
general-topology
Updated April 24, 2018 14:20 PM
1
answers
27
views
2
votes
If there exists an irreducible open covering, then the space is irreducible.
general-topology
algebraic-geometry
zariski-topology
Updated April 24, 2018 11:20 AM
0
answers
6
views
3
votes
Topological structure of the dunce hat
algebraic-topology
homology-cohomology
covering-spaces
fundamental-groups
Updated April 24, 2018 09:20 AM
1
answers
13
views
0
votes
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