and rational homotopy theory (equivariant, stable, parametrized, equivariant & stable, parametrized & stable) The concept of the PL de Rham complex (Bousfield-Gugenheim 76, Sullivan 77) is a variant of that of the de Rham complex for smooth manifolds which applies to general topological spaces and simplicial sets. The terminology “PL” for “piecewise linear” seems to have been tacitly introduced in Bousfield-Gugenheim 76. Beware that despite this commonly adopted terminology (e.g....