Let $S_i$ be a semi-algebra on $\Omega_i$.
Is $\{\prod_{i=1}^na_i:a_i\in S_i\}$ always a semi-algebra on $\prod_{i=1}^n\Omega_i$ ? Yes or No, Why?
2026-04-24 06:36:48.1777012608
Is a product of semi-algebras a semi-algebra itself?
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