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[-] krellor@fedia.io 17 points 8 months ago

Topology: no, a set being open doesn't imply that it is closed. What if it's both? We call it clopen. Moving on.

[-] MxM111@kbin.social 1 points 8 months ago* (last edited 8 months ago)

Interesting. That’s not how I was taught (different time, different language). A set that has some boundary points not being part of a set is open. Otherwise it is closed. It was binary definition. A 1D-sphere (a circle) was classified as a closed set. No boundary. But I looked in google and now it is different.

this post was submitted on 09 Mar 2024
863 points (98.1% liked)

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