## Introduction to the Space Groups |

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### Common terms and phrases

2nhx 2nky 2nlz assemblage belonging calculation cell of type centre of symmetry co-ordinates coalescences coefficients column complete matrix corresponding cosine crystal form deduced digonal axis digonal screw distance easily elementary cell equivalent points example extinction rules F(hkl Fmmm follows form hkl form of equivalent formula Fourier series glide component glide plane glide translation half-periods Harker-lines Harker-matrix Harker-points hkl hkl hkl i y z indicated International Tables give J. D. H. Donnay metry mirror monoclinic Niggli occur odd number orientations ortho-rhombic P(hkl p(xyz parallel parallelepiped passes the origin Pban periodic function plane hkl plane of symmetry primitive Q(hkl reader represented resp screw axes shifting sine space groups D|A structure factor sub-groups suite hkl symbol symmetry centre symmetry elements symmetry planes triclinic triplets unit cell vectors x y z zero