Least action principle of crystal formation of dense packing type and Kepler's conjecture / Wu-Yi Hsiang.
The dense packing of microscopic spheres (i.e. atoms) is the basic geometric arrangement in crystals of mono-atomic elements with weak covalent bonds, which achieves the optimal "known density" of p/v18. In 1611, Johannes Kepler had already "conjectured" that p/v18 should be the...
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