The terminology ‘plus construction’ is used for three very different types of construction.
The version which sends a presheaf to a separated presheaf to a sheaf is described at plus construction on presheaves and sheaf.
The process of killing a perfect normal subgroup of the fundamental group of a space is described under Quillen plus construction.
The assignment, due to John Baez and James Dolan, $O \mapsto O^+$ sending a operad (with colours $S$) to a new operad whose algebras are $S$-coloured operads equipped with an operad morphism to $O$ (i.e. slices over $O$).
Last revised on June 8, 2023 at 14:26:36. See the history of this page for a list of all contributions to it.