Differential geometry of surfaces | Differential geometry

Clairaut's relation (differential geometry)

In classical differential geometry, Clairaut's relation, named after Alexis Claude de Clairaut, is a formula that characterizes the great circle paths on the unit sphere. The formula states that if γ is a parametrization of a great circle then where ρ(P) is the distance from a point P on the great circle to the z-axis, and ψ(P) is the angle between the great circle and the meridian through the point P. The relation remains valid for a geodesic on an arbitrary surface of revolution. A statement of the general version of Clairaut's relation is: Let γ be a geodesic on a surface of revolution S, let ρ be the distance of a point of S from the axis of rotation, and let ψ be the angle between γ and the meridian of S. Then ρ sin ψ is constant along γ. Conversely, if ρ sin ψ is constant along some curve γ in the surface, and if no part of γ is part of some parallel of S, then γ is a geodesic. — Andrew Pressley: Elementary Differential Geometry, p. 183 Pressley (p. 185) explains this theorem as an expression of conservation of angular momentum about the axis of revolution when a particle moves along a geodesic under no forces other than those that keep it on the surface. (Wikipedia).

Video thumbnail

11: Clairaut's Theorem Intuition - Valuable Vector Calculus

Clairaut's theorem, also known as Schwarz's theorem or Young's theorem, says that mixed partial derivatives are equal regardless of order: fₓᵧ = fᵧₓ. In this video, we go through an intuitive explanation based on visual geometry, then some algebra! Full Valuable Vector Calculus playlist:

From playlist Valuable Vector Calculus

Video thumbnail

Differential Equations Ultimate Study Guide

First Order Differential Equations Ultimate Study Guide! The topics include separable differential equations, first-order linear differential equations, exact differential equations, almost exact differential equations, homogeneous differential equations, Bernoulli differential equations,

From playlist Ultimate Study Guide

Video thumbnail

Clever Clairaut Proof

In this video, I give a very clever proof of Clairaut's theorem, which says that if the partial derivatives f_xy and f_yx are continuous at a point, then must be equal. Usually this is proved using difference quotients, but here I give a proof using double integrals. I also give a nice pro

From playlist Partial Derivatives

Video thumbnail

Solve the general solution for differentiable equation with trig

Learn how to solve the particular solution of differential equations. A differential equation is an equation that relates a function with its derivatives. The solution to a differential equation involves two parts: the general solution and the particular solution. The general solution give

From playlist Differential Equations

Video thumbnail

How to solve differentiable equations with logarithms

Learn how to solve the particular solution of differential equations. A differential equation is an equation that relates a function with its derivatives. The solution to a differential equation involves two parts: the general solution and the particular solution. The general solution give

From playlist Differential Equations

Video thumbnail

Find the particular solution given the conditions and second derivative

Learn how to solve the particular solution of differential equations. A differential equation is an equation that relates a function with its derivatives. The solution to a differential equation involves two parts: the general solution and the particular solution. The general solution give

From playlist Solve Differential Equation (Particular Solution) #Integration

Video thumbnail

PDE 9 | Wave equation: general solution

An introduction to partial differential equations. PDE playlist: http://www.youtube.com/view_play_list?p=F6061160B55B0203 Part 9 topics: -- quick argument to find solutions of wave equation -- derivation of general solution of the wave equation (11:54)

From playlist Mathematical Physics II - Youtube

Video thumbnail

My Strategy for Learning Calc 3/ A Guide to Self-Learning Calculus 3 [calculus 3 problem set 📘]

I got a few comments a while ago asking me to go through my strategy for learning calc 3. With the move and trying to figure out how to film in the new apartment I thought it would be a great time to present my guide to self-learning calculus 3 that I used way back right before I started u

From playlist The New CHALKboard

Video thumbnail

Kepler's Laws (8.10)

In this video, I show that Isaac Newton's three laws, when coupled with his universal law of gravitation, give Kepler's three laws, a feat that Newton accomplished in 1687 in his Principia. I also show that the periods and semimajor axes of planetary and asteroid orbits obey Kepler's third

From playlist Intermediate Classical Mechanics

Video thumbnail

C73 Introducing the theorem of Frobenius

The theorem of Frobenius allows us to calculate a solution around a regular singular point.

From playlist Differential Equations

Video thumbnail

How to solve a differentialble equation by separating the variables

Learn how to solve the particular solution of differential equations. A differential equation is an equation that relates a function with its derivatives. The solution to a differential equation involves two parts: the general solution and the particular solution. The general solution give

From playlist Solve Differential Equation (Particular Solution) #Integration

Video thumbnail

The Frenet Serret equations (example) | Differential Geometry 19 | NJ Wildberger

Following from the last lecture on the Frenet Serret equations, we here look in detail at an important illustrative example--that of a helix. The Fundamental theorem of curves is stated--that the curvature and torsion essentially determine a 3D curve up to congruence. We introduce the osc

From playlist Differential Geometry

Video thumbnail

General solution of a separable equation

Learn how to solve the particular solution of differential equations. A differential equation is an equation that relates a function with its derivatives. The solution to a differential equation involves two parts: the general solution and the particular solution. The general solution give

From playlist Differential Equations

Video thumbnail

Multivariable Calculus | Higher partial derivatives.

We discuss higher order partial derivatives with examples and a discussion of Clairaut's Theorem. http://www.michael-penn.net http://www.randolphcollege.edu/mathematics/

From playlist Multivariable Calculus

Video thumbnail

Pre-recorded lecture 1: Introduction. What is Nijenhuis Geometry?

MATRIX-SMRI Symposium: Nijenhuis Geometry and integrable systems Pre-recorded lecture: These lectures were recorded as part of a cooperation between the Chinese-Russian Mathematical Center (Beijing) and the Moscow Center of Fundamental and Applied Mathematics (Moscow). Nijenhuis Geomet

From playlist MATRIX-SMRI Symposium: Nijenhuis Geometry companion lectures (Sino-Russian Mathematical Centre)

Video thumbnail

C35 The Cauchy Euler Equation

I continue the look at higher-order, linear, ordinary differential equations. This time, though, they have variable coefficients and of a very special kind.

From playlist Differential Equations

Video thumbnail

Bernoulli ode

Illustrates the solution of a Bernoulli first-order differential equation. Free books: http://bookboon.com/en/differential-equations-with-youtube-examples-ebook http://www.math.ust.hk/~machas/differential-equations.pdf

From playlist Differential Equations with YouTube Examples

Video thumbnail

Poisson tensors in non-commutative gravity

In this video I go through my master thesis. You can find all the links discussed here: https://gist.github.com/Nikolaj-K/ce2dd6b6da0fbd791529bc8dd9183a74 Links: http://othes.univie.ac.at/16190/ https://arxiv.org/abs/1111.2732 https://www.linkedin.com/in/nikolaj-kuntner-0138aa104/ http

From playlist Physics

Video thumbnail

Particular solution of differential equations

Learn how to solve the particular solution of differential equations. A differential equation is an equation that relates a function with its derivatives. The solution to a differential equation involves two parts: the general solution and the particular solution. The general solution give

From playlist Solve Differential Equation (Particular Solution) #Integration

Related pages

Great circle | Manfredo do Carmo | Surface of revolution | Geodesic | Differential geometry | Unit sphere