1. This ideal forms a regular hexagonal lattice in the complex plane. 2. All seven contain significant amounts of sp 3 hexagonal lattice . 3. Graphene's hexagonal lattice can be regarded as two interleaving triangular lattices. 4. This four-index scheme for labeling planes in a hexagonal lattice makes permutation symmetries apparent. 5. Hex-splines are the generalization of B-splines for 2-D hexagonal lattices . 6. The exact value of is only known for the hexagonal lattice , where it is equal to: 7. Hence the hexagonal lattice provides a superior picture of the structure of the five-limit modulatory space. 8. The proof of this lemma is a clever computation that relies heavily on the geometry of the hexagonal lattice . 9. Alternately, the plane can be tiled by hexagons, and the centers of the hexagons form a hexagonal lattice . 10. Graphene is a single two-dimensional ( 2D ) atomic layer of carbon atom arranged in a hexagonal lattice .