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### AlgTop2: Homeomorphism and the group structure on a circle

This is the first video of the second lecture in this beginner's course on Algebraic Topology. We give the basic definition of homeomorphism between two topological spaces, and explain why the line and circle are not homeomorphic. Then we introduce...### NASA | The MMS Mission's Unique Orbit

Scientist John Dorelli explains the MMS mission's orbit and why the four spacecraft fly in a tetrahedron formation. This complex arrangement enables scientists to gather data about magnetic reconnection in 3D. On its journey, MMS will observe a...### Simulated Reality Hologram Matrix State Space

Introducing quantization directly on the spacetime level via Einstein-Maxwell gravitoelectromagnetic total spin-stress pressure energy (mass) density tensor Hilbert (4D ± 4Di) hologram interference ﬁeld stationary state domain of universal wave...