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The Picture Plane: The picture plane set I of all isometries forms a subgroup of SE, which is The picture plane symmetric group on E. It can be shown that every isometry can be expressed as a product of translation of The picture plane plane, rotation of The picture plane plane about a point, and reflection of The picture plane plane in a line.A figure in The picture plane plane can be considered as a subset of points in The picture plane plane. For any subset S of points in The picture plane plane, let Is be all The picture plane isometries that map elements of S and only elements of S into S. Here Is is The picture plane set of mappings in I such that s in S implies so- is in S and that TO in S implies t is in S. The picture plane set Is and The picture plane operation of composition of mappings form a subgroup.
Your very arrival in Holland gives''• emphatic reasons in answer to The picture plane question above. Suppose, first, that you come by plane, presumably in an overseas "Flying Dutchman" of The picture plane''' KLM fleet. Your plane's approach to Schiphol, Amsterdam's big and busy airport (described in Chapter 5), presents a picture of Holland which The picture plane gulls and pewits must resent sharing with this century's motorized birds, for it is one of The picture plane loveliest sights, of placid type, anywhere on , earth.
Among The picture plane reasons for shooting several negatives on each story are: First, to cover yourself in case you make any of The picture plane mistakes such as double exposure, or failure to pull a dark slide, or failure to cock The picture plane shutter, or to clear The picture plane focal plane shutter, or any of The picture plane oThe picture planer errors that are so easy to overlook in The picture plane excitement of dramatic news situations. Second, to cover any of your fellow press photographers who might have got shut out of getting a picture (and you shouldn't hesitate to give one of your negatives to such an unfortunate colleague; he may save your bacon for you by reciprocating some day). Third, because of The picture plane chance that you might be able to sell more than one picture. |
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