Archive image from page 103 of Design for a brain (1954). Design for a brain . designforbrain00ashb Year: 1954 B Figure 7/8/2 : The two fields of the system composed of A and B. P is in the same position in each field. Then so long as no step-function changes value during the con- struction, the main variables will be found to form an absolute system, and to have a definite field. But on different occasions different fields may be found. The number of different fields shown by the main variables is equal to the number of combinations of values provided by the step-functions. 1J9. These consid
Archive image from page 103 of Design for a brain (1954). Design for a brain . designforbrain00ashb Year: 1954 B Figure 7/8/2 : The two fields of the system composed of A and B. P is in the same position in each field. Then so long as no step-function changes value during the con- struction, the main variables will be found to form an absolute system, and to have a definite field. But on different occasions different fields may be found. The number of different fields shown by the main variables is equal to the number of combinations of values provided by the step-functions. 1J9. These considerations throw light on an old problem in the theory of mechanisms. Can a ' machine ' be at once determinate and capable of spon- taneous change ? The question would be contradictory if posed by one person, but it exists in fact because, when talking of living organisms, one school maintains that they are strictly determinate while another school maintains that they are capable of spon- taneous change. Can the schools be reconciled ? 88
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