The notion of elementary diameter is introduced to provide, in the context of Locale Theory, a constructive notion of metrisability. Besides foundational aspects, elementary diameters allow to express metrisability in locales more simply with respect to the existing (non-constructive) approach based
Constructive algebraic topology
โ Scribed by Julio Rubio; Francis Sergeraert
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- French
- Weight
- 194 KB
- Volume
- 126
- Category
- Article
- ISSN
- 0007-4497
No coin nor oath required. For personal study only.
โฆ Synopsis
The classical "computation" methods in Algebraic Topology most often work by means of highly infinite objects and in fact are not constructive. Typical examples are shown to describe the nature of the problem. The Rubio-Sergeraert solution for Constructive Algebraic Topology is recalled. This is not only a theoretical solution: the concrete computer program Kenzo has been written down which precisely follows this method. This program has been used in various cases, opening new research subjects and producing in several cases significant results unreachable by hand. In particular the Kenzo program can compute the first homotopy groups of a simply connected arbitrary simplicial set.
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