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I would argue they are minima, and therefore it is meaningful.
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Actually, answering your question, I think the answer is two. They could be at equidistant points on a sphere, with 1.5 m between them on the 2D surface. Or they could be on a slightly bigger sphere, with 1.5 m along the edges of the tetrahedron in 3D space.
chez_jay
AlexD
@itsbruce
I don't know how many dimensions you need to achieve social distancing like this.
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