SET THEORY. “The human mind is a product of the brain and verbal language as was argued in The Extended Mind: The Emergence of Language, the Human Mind and Culture (Logan 2007), but verbal language as we have argued was dependent on the ability of humans to think in terms of sets employing a primitive form of set theory.”
https://link.springer.com/chapter/10.1007/978-3-030-59177-9_13