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infinite symmetric product
In algebraic topology, the infinite symmetric product SP(''X'') of a topological space ''X'' with given basepoint ''e'' is the quotient of the disjoint union of all powers ''X'', ''X''2, ''X''3, ... obtained by identifying points (''x''1,...,''x''''n'') with (''x''1,...,''x''''n'',''e'') and identifying any point with any other point given by permuting its coordinates. In other words its underlying set is the free commutative monoid generated by ''X'' (with unit ''e''), and is the abelianization of the James reduced product.
The infinite symmetric product appears in the Dold–Thom theorem.
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