#topology — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #topology, aggregated by home.social.
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While teaching a course on algebraic theories last semester I mentioned at some point that the familiar bicomplete categories Top and Poset were not algebraic, but were topological. A student asked about this later on and I found that the #Wikipedia page on «topological category» pointed to categories enriched in Top, not categories with a forgetful functor to Set which is topological. While I have lost a lot of faith in Wikipedia recently, I am pleased to report that https://en.wikipedia.org/wiki/Topological_category is now a disambiguation page.
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#GeorgeSmoot - How Significant is an #Expanding #Universe?
https://www.youtube.com/watch?v=4eDUlBaSDWo
#Philosophy #PhilosophyOfScience #Science #Physics #PhilosophyOfCosmology #Cosmology #Expansion #ExpandingUniverse #Astronomy #Astrophysics #CMB #CosmicMicrowaveBackground #Hubble #BigBang #Topology #Geometry #GR #GeneralRelativity #Flatness #StandardModel #CloserToTruth #RobertKuhn