The ability to conceive simultaneously of a whole and two parts, e.g. conceiving of 10 and also of the parts 6 and 4. This means the mathematicians do not need to rely on counting-by-ones to add and subtract.
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The ability to conceive simultaneously of a whole and two parts, e.g. conceiving of 10 and also of the parts 6 and 4. This means the mathematicians do not need to rely on counting-by-ones to add and subtract.