Necessity, which is placed in relation to the interpretation of the subject’s schemes, is approached from a psychogenetic perspective, including several references to the history of scientific thought. The stages in the formation of necessity are parallel to those of the ‘possible’, each giving the other mutual support during psychogenesis, which can be construed as an alternation of access (onto new possibilities) and of closure (in systems which are the grounds of necessity). Moreover, the force of necessity increases with its stages of development, and the evolution of the necessary constitutes, with that of the ‘possible’, a general framework which determines the formation of operational s
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