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Proving $f : \Bbb R \to S^1 , f (t) = e^{2iπt}$ is an open map.

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#real-analysis #general-topology
53
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Proving a function is continuous by writing it as composition of continuous functions

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#general-topology #metric-spaces
95
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Do we really need $X$ to be compact Hausdorff?

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#general-topology #proof-verification #ring-theory
68
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Is A is open/closed?

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#general-topology
225
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Sequential compact set in $\mathbb R^2$

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#general-topology
70
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How is the similarity of two shapes formally defined?

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#general-topology #geometry
380
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Closed and open sets in subspace

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#general-topology
100
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Fibration in topology

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#general-topology #algebraic-topology #homotopy-theory
153
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Development of topology and differential geometry in ETCS

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#general-topology #differential-geometry #foundations
99
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Characterization of irreducible spaces in terms of sheaves

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#general-topology #sheaf-theory
208
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Which two of the following space are homeomorphic to each other?

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#general-topology #continuity
258
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Application of topology in image processing

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#general-topology #soft-question #image-processing
64
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let $X$ be an arbitrary Hausdroff space, then is $X\setminus\{x_0\}$ always dense?

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#general-topology
828
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What happens to inequalities when $\epsilon$ $\to$ $0$?

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#real-analysis #general-topology #measure-theory
169
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Compare different topologies on $C[a,b]$

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#general-topology

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