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978-90-277-2341-3D. Reidel Publishing Company, Dordrecht, Holland 1986谦卑 发表于 2025-3-22 06:07:27
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For applications it is important to decide wether two different lattice bases belong to one and the same lattice T.. This problem is solved through the determination of an integral reduced form denoted here as ℤ-reduced.宽度 发表于 2025-3-22 18:41:55
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The Old Order and Its Discontents,We now use the important concept of a mathematical group. The group elements are the symmetry operations. The group multiplication is the composition of symmetry operations as described in section 1.4.Prosaic 发表于 2025-3-23 04:29:28
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Siemens-Design Grundlagen und Perspektiven,Up till now symmetry groups were considered only which leave at least one point fixed. This restriction is now removed and we investigate groups of symmetry operations which act transitively on a regular point system XCE..