- Commit
- c91fa9daa34da90d1461793012ede89b9667343c
- Parent
- f35c307cf440842d82d2a6034c1a151a87cd2669
- Author
- Pablo <pablo-escobar@riseup.net>
- Date
Changed the statement of the Jacobi-Darboux theorem
Also added minor clarifications
Riemannian Geometry course project on the manifold H¹(I, M) of class H¹ curves on a Riemannian manifold M and its applications to the geodesics problem
Changed the statement of the Jacobi-Darboux theorem
Also added minor clarifications
1 file changed, 4 insertions, 5 deletions
Status | File Name | N° Changes | Insertions | Deletions |
Modified | sections/applications.tex | 9 | 4 | 5 |
diff --git a/sections/applications.tex b/sections/applications.tex @@ -487,8 +487,7 @@ however, is the following consequence of Morse's theorem. \begin{enumerate} \item If there are no conjugate points of \(\gamma\) then there exists a neighborhood \(U \subset \Omega_{p q} M\) of \(\gamma\) such that - \(E(\eta) > E(\gamma)\) and \(\ell(\eta) > \ell(\gamma)\) for all \(\eta - \in U\) with \(\eta \ne 0\). + \(E(\eta) > E(\gamma)\) for all \(\eta \in U\) with \(\eta \ne 0\). \item Let \(k > 0\) be the sum of the multiplicities of the conjugate points of \(\gamma\) in the interior of \(I\). Then there exists an @@ -525,8 +524,7 @@ however, is the following consequence of Morse's theorem. As for part \textbf{(ii)}, fix \(\delta > 0\) and an orthonormal basis \(\{X_i : 1 \le i \le k\}\) of \(T_\gamma^- \Omega_{p q} M\) consisting of - eigenvectors of \(A_\gamma\) with negative eigenvalues \(- \lambda_i\). - Define + eigenvectors of \(A_\gamma\) with negative eigenvalues \(- \lambda_i\). Let \begin{align*} i : B^k & \to \Omega_{p q} M \\ v & \mapsto \exp_\gamma(\delta (v_1 \cdot X_1 + \cdots + v_k \cdot X_k)) @@ -538,5 +536,6 @@ however, is the following consequence of Morse's theorem. E(i(v)) = E(\gamma) - \frac{1}{2} \delta^2 \sum_i \lambda_i \cdot v_i + \cdots \] - we find that \(E(i(v)) < E(\gamma)\) for sufficiently small \(\delta\). + we find that \(E(i(v)) < E(\gamma)\) for sufficiently small \(\delta\). In + particular, \(\ell(i(v)) \le E(i(v))^2 < E(\gamma)^2 = \ell(\gamma)\). \end{proof}