Nkebi ahịrịokwu 1: Ọ bụrụ na elu nwere nkwụsịtụ na-enweghị nkwụsịtụ, ọ bụ elu Euclidean na geometry nke elu bụ geometry Gaussian. Nkebi ahịrịokwu nke abụọ: Ọ bụrụ na elu ala nwere nkwụsịtụ na-enweghị nkwụsịtụ, mgbe ahụ, ọ bụ elu Euclidean na geometry nke elu bụ geometry Gaussian. Ajụjụ: Ọ̀ bụ otu ihe ka ahịrịokwu nke mbụ na nke abụọ pụtara? Ee ma ọ bụ Ee e?
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