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A note on closed geodesics for a class of non-compact by Secchi S.

By Secchi S.

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Seminaire Bourbaki quantity forty three web page 1 2000-2001 [doi UNKNOWN] Laurent Bonavero -- Factorisation faible des functions birationnelles

Seminaire Bourbaki quantity forty three web page 39 2000-2001 [doi UNKNOWN] Marco Brunella -- Courbes entieres dans les surfaces algebriques complexes

Seminaire Bourbaki quantity forty three web page sixty three 2000-2001 [doi UNKNOWN] Michel Emery -- Espaces probabilises filtres : de los angeles theorie de Vershik au mouvement brownien, through des idees de Tsirelson

Seminaire Bourbaki quantity forty three web page eighty five 2000-2001 [doi UNKNOWN] Marc Herzlich -- Linegalite de Penrose

Seminaire Bourbaki quantity forty three web page 113 2000-2001 [doi UNKNOWN] Michele Audin -- Integrabilite et non-integrabilite de systemes hamiltoniens

Seminaire Bourbaki quantity forty three web page 137 2000-2001 [doi UNKNOWN] Pierre Cartier -- Fonctions polylogarithmes, nombres polyzetas et groupes pro-unipotents

Seminaire Bourbaki quantity forty three web page a hundred seventy five 2000-2001 [doi UNKNOWN] Antoine Chambert-Loir -- Theoremes d algebricite en geometrie diophantienne

Seminaire Bourbaki quantity forty three web page 211 2000-2001 [doi UNKNOWN] Philippe Michel -- Repartition des zeros des fonctions L et matrices aleatoires

Seminaire Bourbaki quantity forty three web page 249 2000-2001 [doi UNKNOWN] Michele Vergne -- Quantification geometrique et aid symplectique

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Seminaire Bourbaki quantity forty three web page 301 2000-2001 [doi UNKNOWN] man Henniart -- Progres recents en fonctorialite de Langlands

Seminaire Bourbaki quantity forty three web page 323 2000-2001 [doi UNKNOWN] Emmanuel Peyre -- issues de hauteur bornee et geometrie des varietes

Seminaire Bourbaki quantity forty three web page 345 2000-2001 [doi UNKNOWN] Georges Skandalis -- Geometrie non commutative, operateur de signature transverse et algebres de Hopf

Seminaire Bourbaki quantity forty three web page 365 2000-2001 [doi UNKNOWN] Cedric Villani -- Limites hydrodynamiques de l equation de Boltzmann

Extra info for A note on closed geodesics for a class of non-compact Riemannian manifolds

Example text

Then for each W ∈ Z(N ) there is a scalar-valued function h on K such that W G(t) = h(t)G(t) for all t ∈ ch(N ), G ∈ N. Proof. Suppose that (i) holds and W ∈ Z(N ). Given t ∈ ch(N ), let us define P (t) on Y (t) by P (t)u = W G(t), where G ∈ N with G(t) = u. If H ∈ N with H(t) = u, let y ∗ ∈ ext(Y (t)∗ ). By (i), we have y ∗ ◦ ψt ∈ ext(N ∗ ), and since W is a multiplier, there is a scalar aW (y ∗ , t) such that (17) W ∗ (y ∗ ◦ ψt ) = aW (y ∗ , t)(y ∗ ◦ ψt ). 5 to show that P (t) ∈ Z(Y (t)), and since the latter has dimension 1, there is a scalar h(t) so that W G(t) = P (t)u = h(t)u = h(t)G(t).

2 2 Case 2. f = f (2) ≥ |f (1)|. Here we have f (2) − f (1) ≥ 0 and f (2) + f (1) ≥ 0 so that again by (12) we see that f (1) − f (2) f (1) + f (2) e1 + e2 2 2 f (1) + f (2) f (2) − f (1) = e1 + e2 2 2 f (1) + f (2) f (2) − f (1) = + 2 2 = f (2) T f (2) = − = f (1) + f (2) f (1) − f (2) + . 2 2 The other cases are handled in the same way, and we see that T is an isometry. 2 for either of t = 1 or t = 2 and so cannot be a generalized weighted composition operator. 32 7. THE BANACH-STONE PROPERTY We note here that if Y contains a copy of ∞ (2)(over the same field as Y ), then there are elements y1 , y2 of S(Y ) such that if y = ay1 + by2 , then y = max{|a|, |b|}.

In particular, the conclusions hold when A, B are regular closed subalgebras. Proof. 10, there are continuous functions ϕ from K0 (T ) onto Q and ψ from K0 (T −1 ) onto K, as well as bounded operators V (t), W (s) such that T F (t) = V (t)F (ϕ(t)) for t ∈ K0 (T ), F ∈ M ; T −1 G(s) = W (s)G(ψ(s)) for s ∈ K0 (T −1 ), G ∈ N. If t ∈ K, then t = ψ(s) for some s ∈ K0 (T −1 ). If t ∈ / K0 (T ), there is some r ∈ K0 (T ) with r = t such that s = ϕ(r). Let G be any element of N so that G(t) = 0. 8 applied to T −1 , we necessarily have T −1 G(s) = 0.

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