Research by Gelman questioned Piaget's assumptions about young children's ability to understand numbers
Jean Piaget (1896-1980) was a Swiss epistemologist who conducted studies focused on learning and childhood.
One of the aspects Piaget studied was the children understanding of numbers, about this, Piaget proposed the understanding is based on equinumerosity that implies relating two sets of items and understanding whether the sets have more or less items.
This idea was disproven by Gelman who proposed this understanding is based on cardinality that means a specific amount of items is equivalent to a symbol represented as a number.
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