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• 09:18, 16 October 2026 Rongzhou talk contribs created page Direct product (sets) (Created page with "If $A_i:i=1,2, \ldots, n$ are sets, their '''direct product''' $$ \begin{equation*} A_1\times A_2 \times \cdots \times A_n=\{(a_1, a_2 \ldots, a_n): a_i \in A_i\}; \end{equation*} $$ <ref>{{#cite:Q2194}}</ref>")