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Closed maps with non-compact fibers

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#general-topology #compactness #closed-map
58
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If $Tx=0$ is $T$ necessarily closed

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#real-analysis #functional-analysis #normed-spaces #closed-graph #closed-map
742
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Integral ring homomorphism implies induced map on spectra is closed

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#algebraic-geometry #ring-theory #maximal-and-prime-ideals #closed-map
74
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Proving $X$ is compact using a function $f\colon X \to Y$?

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#general-topology #continuity #compactness #open-map #closed-map
35
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Regarding a problem related to projection map in functional analysis

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#functional-analysis #closed-map
89
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$f\times\text{id}$ is closed for a closed map $f$ with $f^{-1}(y)$ compact $\forall y\in Y$

Published on
#general-topology #product-space #closed-map
135
Views

T is a closed map if dim(Y/T(X)) is finite

Published on
#closed-map
71
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Is this a closed map?

Published on
#continuity #closed-map
128
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Which one of the following implies the other?

Published on
#general-topology #metric-spaces #proof-writing #compactness #closed-map
705
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Characterizations of continuous, closed, and open maps

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#general-topology #continuity #open-map #closed-map
91
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Some questions regarding continuity and open and closed sets.

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#continuity #metric-spaces #examples-counterexamples #open-map #closed-map
66
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Why can the continuous function of a non compact set be compact

Published on
#general-topology #compactness #closed-map
210
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Is the one-point compactification terminal in the „category of compactifications“?

Published on
#general-topology #category-theory #compactification #closed-map
55
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Prove Existence Periodic Solution Nonlinear Pendulum with Torque

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#nonlinear-system #periodic-functions #closed-map
790
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A restriction of a closed map is a closed map?

Published on
#general-topology #open-map #closed-map

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