Henri Poincaré
✍ Scribed by Ernest Lebon
- Publisher
- John Wiley and Sons
- Year
- 1912
- Tongue
- English
- Weight
- 358 KB
- Volume
- 192
- Category
- Article
- ISSN
- 0004-6337
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📜 SIMILAR VOLUMES
We consider a real planar analytic vector field, X, such that the origin, O, is a centre for the linearization of X. Poincare's condition of reversibility with respect to a line passing through O is then a sufficient condition for O to be a centre for the vector field X. We provide necessary and suf
## Manifest gauge invariance is known to be incompatible with manifest Poincarb covariance (Strocchi's theorem). By extending the notion of gauge invariance to that of gauge covariance. we circumvent that incompatibility, at least for free electromagnetic potentials. In the new formulation the p
We give a detailed and mainly geometric proof of a theorem by N. N. Nekhoroshev for hamiltonian systems in n degrees of freedom with k constants of motion in involution, where 1 ≤ k ≤ n. This state's persistence of k-dimensional invariant tori, and local existence of partial action-angle coordinates