G. N. M. Tyrell has put forward the terms 'divergent' and 'convergent' to distinguish problems which cannot be solved by logical reasoning from those that can. Life is being kept going by divergent problems which have to be 'lived' and are solved only in death. Convergent problems on the other hand are man's most useful invention; they do not, as such, exist in reality, but are created by a process of abstraction. When they have been solved, the solution can be written down and passed on to others, who can apply it without needing to reproduce the mental effort necessary to find it. If this
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