Titlebook: Geometric Crystallography; An Axiomatic Introdu Peter Engel Book 1986 D. Reidel Publishing Company, Dordrecht, Holland 1986 crystal.crystal

干涉

忘恩負(fù)義的人

Atoms may be considered as small rigid balls. The packing of balls is an important concept in crystallography for the description of crystal structures, that is, the arrangement of atoms in a crystal. Many inorganic crystal structures are based on densest packings of balls.

Phagocytes

不妥協(xié)

Evocative

Reduction of Quadratic Forms,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 ?-reduced.

acrobat

Crystallographic Symmetry Operations,In this chapter We investigate the restrictions imposed by a lattice on the symmetry operations acting on a regular point system X C E..

Fatten

抑制

反復(fù)拉緊

Space Groups,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..

ABASH

Space Partitions,The investigation of space partitions permits us to get a better insight into the discontinuum. The most important result of this chapter will be the regularity condition which is discussed in section 9.4.