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/sci/ - Science & Math

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>> No.8377686 [View]
File: 1.44 MB, 2000x2000, 2000px-Sphere_wireframe_10deg_6r.svg.png [View same] [iqdb] [saucenao] [google]
8377686

Can anyone recommend me a good book on Lie groups that walks you through the prerequisites of differentiable manifolds? My analysis and group theoretic skills are quite alright.

>> No.7769218 [View]
File: 1.44 MB, 2000x2000, Sphere.png [View same] [iqdb] [saucenao] [google]
7769218

>>7768409
If a black hole is a perfect sphere in space time then there must also certainly exist an anti-sphere which expels matter, I just don't know where it's getting the matter

>> No.7604408 [View]
File: 1.44 MB, 2000x2000, Sphere.png [View same] [iqdb] [saucenao] [google]
7604408

What's the conceptual opposite of a sphere?

>> No.7071713 [View]
File: 1.44 MB, 2000x2000, 2000px-Sphere_wireframe_10deg_6r.svg.png [View same] [iqdb] [saucenao] [google]
7071713

Is there a rule of thumb for when it is OK to assume that a body is simply a point mass when it comes to gravitational attraction (classical mechanics)?

For example could I assume that a hallow sphere of non-insignificant thickness is a point mass?

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