Arnold J. Pomerans | Akateeminen Kirjakauppa

First published in 1974. This is Volume VIII of selected works of Jean Piaget which along with Burbel Inhelder, looks at how children construct continuous quantity. That is where a quantity that is even more general than number or measurement, and gets included as special cases, namely the extensive quantity characterized by the comparison of the parts without the specification of a unit.