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2mky ac's applied arbitrary signs atomic coordinates b d,b calculated centre of symmetry centrosymmetrical structure chart Cochran and Douglas coincidence array complexity considered correct solution corresponding derived difference card direct methods electron density equal atoms equal resolved atoms example fluorene Fourier synthesis give given glide plane h–H h Hauptman and Karle higher symmetry incorrect sign inequality relationships large number magnitude mathematical method of structure negative observed intensities origin overlap Patterson function possible primary set primitive cell probable sign projection reciprocal lattice reciprocal space result salicylic acid Sayre's equation scattering factor screw axis sets of signs shown in Fig sign determination sign relationships sign symbols ſº solved space group pgg structure containing structure factor equation structure invariants summation symmetry elements Table tetraethyl diphosphine disulphide total number Uh-h unit cell unitary structure factors vector Z-test