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hal
acz
It seems like shapes that have sharpe edges or intersections are not manifold
skim
I'm not sure if sharp edges disqualifies a shape from being manifold - e.g. tetrahedron or a cube.
mrn
I wonder what is an intuitive definition of manifold?
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The top left and top right are not manifold because at certain areas, no matter how closely you zoom in, it doesn't look like a plane