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Geometry and Topology

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Algebraic topology, algebraic geometry, differential geometry, general topology, geometric topology, symplectic geometry, metric geometry, K-theory and homology || part of #mathematics-on:matrix.org28 Servers

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20 May 2024
@quantum:envs.netcas [they/them] changed their display name from cas to cas [they/them].10:39:08
22 May 2024
@gm_z:matrix.orggm_zit's kind of strange that colimits of compact spaces isn't necessarily compact, but colimits of compactly generated spaces is compactly generated15:05:24
@gm_z:matrix.orggm_zdoes anyone have any intuition for this15:05:30
23 May 2024
@quantum:envs.netcas [they/them]
In reply to @gm_z:matrix.org
it's kind of strange that colimits of compact spaces isn't necessarily compact, but colimits of compactly generated spaces is compactly generated
Isn't the topology of a compactly generated space defined by a family of maps into it?
17:34:28
@quantum:envs.netcas [they/them]Taking colimits should preserve this according to my intuition17:35:30
@somenick:matrix.orgsomenick hello. i'm stalled with notation learning algebraic topology. Would anybody know, what i_x0 and i_x1 can mean here? 17:47:28
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17:48:14
@gm_z:matrix.orggm_z
In reply to @quantum:envs.net
Isn't the topology of a compactly generated space defined by a family of maps into it?
hm which family of maps?
18:21:19
@gm_z:matrix.orggm_z
In reply to @somenick:matrix.org
hello. i'm stalled with notation learning algebraic topology. Would anybody know, what i_x0 and i_x1 can mean here?
i_{x_0} \colon I \to X is the constant map t \mapsto x_0, likewise for i_{x_1}
18:22:05
@quantum:envs.netcas [they/them]
In reply to @gm_z:matrix.org
hm which family of maps?
All functions K -> X where K is compact
18:24:24
@quantum:envs.netcas [they/them] Iirc the definition of a compactly generated space is one where the topology on that space is the final topology for some given set of functions K -> X 18:25:59
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