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15
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Is there any closed embedding which is not cofibration?

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#general-topology #algebraic-topology #retraction #cofibrations
173
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Show that a retract of a cofibration is also a cofibration.

Published on
#algebraic-topology #knot-theory #k-theory #retraction #cofibrations
55
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Is it ever useful to consider cofibrations which satisfy the HEP only with respect to a proper subclass of spaces?

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#general-topology #algebraic-topology #homotopy-theory #fibration #cofibrations
112
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Express the Klein bottle as the cofibre of a map $\kappa$ between (wedges of ) copies of $S^1.$

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#general-topology #algebraic-topology #knot-theory #cofibrations
311
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Closed inclusion

Published on
#category-theory #model-categories #fibration #cofibrations
130
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Cofibrations in diagram category

Published on
#category-theory #limits-colimits #model-categories #cofibrations
89
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Two apparently different definitions of a path object in the model category theory

Published on
#category-theory #model-categories #cofibrations
374
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any cofibration $i:A \to B$ is a homeomorphism onto its image (question regarding the inverse map)

Published on
#algebraic-topology #homotopy-theory #diagram-chasing #cofibrations #homotopy-extension-property
119
Views

Homotopy equivalence of fibers and cofibers

Published on
#algebraic-topology #homotopy-theory #fibration #cofibrations
72
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notation about $hfib(f,y_0)$

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#general-topology #algebraic-topology #notation #fibration #cofibrations
56
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Definition of 'cofiber' of a module homomorphism

Published on
#commutative-algebra #category-theory #modules #cofibrations
67
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Is this map a cofibration in a model category?

Published on
#algebraic-topology #homotopy-theory #model-categories #cofibrations
283
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Pushout of equivalences along cofibrations are equivalences

Published on
#algebraic-topology #homotopy-theory #cofibrations
137
Views

Good pair vs. well-pointed space

Published on
#general-topology #algebraic-topology #definition #cofibrations
40
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K-theory and the cohomology of categories

Published on
#homology-cohomology #k-theory #cofibrations

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