## In general, we mean by any concept nothing more than a set of operations; the concept is synonymous with the corresponding set of operations.

## Bridgman, 1927, The Logic of Modern Physics, p. 5.

## (4) Exact definitions of psychological concepts are best given by functional equations. On one side of the equation stand experimental observations and operations; on the other a word or phrase designed to comprehend them.

## Pratt, 1939, The Logic of Modern Psychology, p. ix.

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