Functions of a complex variable Basic notions Concept
Cross-ratio
Summary
The cross-ratio is a number made from four points of a line, or of the Riemann sphere, see the definition. It does not change under Möbius transformations and, more generally, under projective transformations.
Where this leads
1 page builds on this one.
Further reading
- Web https://en.wikipedia.org/wiki/Cross-ratio, lead section
About this page
| Tag | 09ASMRMD67 |
|---|---|
| URI | m2://09ASMRMD67 |
| Aliases | cross-ratio, double-ratio, anharmonic-ratio |
| Kind | concept |
| Writing | W1 stated |
| MSC | 30C35 |
| Same as |
Markdown · JSON · Edit on GitHub
What this page needs for W2
- edge instance_of in: at least two examples (0 of 2)
- edge not_instance_of in: at least one non-example (0 of 1)
- edge specializes both: the more general notions and the special cases (0 of 1)
The writing levels say how complete the text of a page is. They do not measure its truth.