homotopy theory, (∞,1)-category theory, homotopy type theory
flavors: stable, equivariant, rational, p-adic, proper, geometric, cohesive, directed…
models: topological, simplicial, localic, …
see also algebraic topology
Introductions
Definitions
Paths and cylinders
Homotopy groups
Basic facts
Theorems
In the context of square matrices an upper triangular matrix is one all whose entries below the diagonal vanish. Analogously for a lower triangular matrix.
See also
Last revised on January 27, 2019 at 19:48:50. See the history of this page for a list of all contributions to it.