## Introduction to the Space Groups |

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### Common terms and phrases

2n hx 2nhx 2nky 2nlz assemblage belonging calculation cell of type centre of symmetry co-ordinates coalescences coefficients column complete matrix corresponding cosine crystallographic 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 Harker-lines Harker-matrix Harker-points indicated International Tables give Let us take mentioned metry mirror monoclinic Niggli occur odd number orientations ortho-rhombic P(hkl p(xyz parallel parallelepiped passes the origin Pban periodic function plane of symmetry planes hkl primitive Q(hkl reader represented resp respectively result rhombic screw axes shifting sine space group squares structure factor sub-groups suite hkl symbol symmetry centre symmetry elements symmetry planes triclinic triplets unit cell vectors x y z zero