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| | Crystallographic Topology - Critical Nets 1 |
 | | The first application of Morse theory to crystal physics was by van Hove (1953), who showed that certain singularities in lattice dynamics originate from crystallographic symmetry. |
 | | Some formal results concerning Morse functions on orbifolds are also starting to appear in the mathematical preprint literature (e.g., Lerman and Tolman, 1995), but these are primarily based on symplectic rather than Euclidean geometry (cf., Kirwan, 1984), which is beyond our mathematical capabilities to extend into algebraic geometry. |
 | | The crystallographic case closest to the general Morse inequality limits is the diamond structure in space group #227 with basic unit critical point counts of (1,2,2,1) and unit cell counts (8,16,16,8). |
| www.ornl.gov /sci/ortep/topology/critnet.html (2573 words) |
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