This booklet is a book in Swiss Seminars, a subseries of growth in arithmetic. it's an accelerated model of the notes from a seminar on intersection cohomology thought, which met on the college of Bern, Switzerland, within the spring of 1983. This quantity offers an creation to the piecewise linear and sheaf-theoretic types of that idea as built by means of M. Goresky and R. MacPherson in Topology 19 (1980), and in Inventiones Mathematicae seventy two (1983). a few familiarity with algebraic topology and sheaf idea is assumed.
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