N'ịzaghachi akwụkwọ abụọ nke W.V.O. Quine (1960, 1967), Lewis (1969) jiri usoro egwuregwu mee ihe iji zụlite akụkọ nkà ihe ọmụma nke nkwekọrịta. N'ime nke a, o nyere nyocha mbụ nke ihe ọmụma nkịtị ma jiri ya nyochaa egwuregwu na egwuregwu nhazi. Na mgbakwunye, ọ bụ onye mbụ kwuru na mmadụ nwere ike ịghọta ihe ọ pụtara n'ihe gbasara egwuregwu akara. Ọtụtụ ndị ọkà ihe ọmụma emeela ihe a kemgbe Lewis. N'ịgbaso Lewis (1969) usoro egwuregwu nke mgbakọ, Edna Ullmann-Margalit (1977) na Bicchieri Ga (2006) mepụtara usoro iwu nke ọha na eze nke na-akọwa ha dị ka nsogbu Nash nke na-esite n'ịgbanwe egwuregwu agwakọta agwakọta gaa na egwuregwu nhazi.
echiche egwuregwu evolushọn