Question

What is pairwise disjoint?

Answer

Pairwise Disjoint is:
$\mathrm{Sets}{A}_1,A_2\dots A_n\mathrm{ are\; said\; to\; be\; pairwise\; disjoint\; if}{A}_i\cap A_j=\Phi \mathrm{ for\; all }i\mathrm{ and }j,\mathrm{with}i\ne j.$
$\mathrm{The\; term\; can\; also\; be\; applied\; to\; an\; infinite\; collection\; of\; sets.}$

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