-
Recent Posts
- Monopole and dipole dynamics on Riemann surfaces
- The Symmetries of the Quantum Kepler Problem
- The geometry of a second order differential equation, part 2
- The geometry of a second order differential equation, part 1
- The geometry of y”+y=0
- Vortex dynamics
- The Gelfand-Fuchs cocycle
- The Schwarzian derivative
- The Lie bracket is torsion
- The cross ratio
- Sample variance
- Calculating the Lie algebra of a Lie group
- The partial derivative as a quotient
- Second derivative as a quotient
- The second differential
Recent Comments
Vortex dynamics | Cu… on The Schwarzian derivative Archives
- July 2022 (1)
- January 2022 (1)
- July 2020 (3)
- January 2020 (1)
- July 2016 (1)
- September 2015 (1)
- June 2015 (1)
- May 2015 (1)
- April 2015 (2)
- March 2015 (1)
- February 2015 (1)
- January 2015 (1)
Categories
- cohomology (1)
- complex analysis (1)
- differential equations (3)
- differential geometry (3)
- Lie groups (2)
- Okategoriserade (2)
- projective geometry (5)
- statistics (1)
Tags
Meta
Tag Archives: cross ratio
The Schwarzian derivative
For a diffeomorphism between two Euclidean lines, the derivative is an invariant in the sense that to calculate the derivative we fix Euclidean coordinate systems on the domain and on the range and the calculated value will not depend on the … Continue reading
The cross ratio
The purpose of this post is to show how the cross ratio can be understood as a generalisation of the corresponding invariants in Euclidean and affine geometry and how it is closely related to the concept of a point frame. … Continue reading
Posted in projective geometry
Tagged cross ratio, harmonic, projective frame, projective line
Leave a comment
Curved Maths 