Abstract In 1977, Appel and Haken proved that every planar graph is four vertex colourable.
An extensive library of mechanism models representing the majority of planar linkages found in practice is provided.
As a closed shell singlet, 7 is planar and aromatic, with C 2v symmetry.
Epithelial planar cell polarity refers to situations in which cells become polarized within the plane of an epithelium.
For example, when a planar fragment is fitted to an almost planar fragment one fit may involve inversion of the non-planar fragment.
Locating specific metal coordination geometries, e.g. tetrahedral rather than square planar.
Observations of individual SLAMS also suggests that they are not planar on these scales.
The company's researchers recently released a new generation of planar waveguides.
The inability of the planar molecules to stack up would prevent polymerization from taking place.
The TRIANGULATE procedure constructs a Delaunay triangulation of a planar set of points.
This contained work on planar and spherical trigonometry originally done much earlier in about 1464.
This suggests that the lower energy state is square planar.
Three groups of electrons around an atom X, always give a trigonal planar arrangement around the central atom X-.