Join (topology)

In topology, a field of mathematics, the join of two topological spaces A and B, often denoted by , is defined to be the quotient space where I is the interval [0, 1] and R is the relation defined by In effect, one is collapsing to and to .Intuitively, is formed by taking the disjoint union of the two spaces and attaching a line segment joining every point in A to every point in B.
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