DIFFERENTIAL GEOMETRY AND ITS APPLICATIONS
Volume 10, Number 1, January 1999

Contents

M.D. Shepherd
Line congruences as surfaces in the space of lines 1

K. Mohnke
On fillings by holomorphic discs of the levels of a Morse function 27

D.R. Grigore
The variational sequence on finite jet bundle extensions and the Lagrangian formalism 43

D.R. Grigore
Variationally trivial Lagrangians and locally variational differential equations of arbitrary order 79

Forthcoming papers
(see also the current list on http://jdga.slu.cz.dirjdga/forth.html)

F. Antonacci, A. Germinario and R Sampalmieri
Light rays having extreme points with the same spatial coordinates
J.F. Carinena and H. Figueroa

Recursion operators and constants of motion in supermechanics
P.Z. Koba

Explicit doubly-hermitian metrics
D. lvansic
Finite-volume hyperbolic 4-manifolds that share a fundamental polyhedron

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DIFFERENTIAL GEOMETRY AND ITS APPLICATIONS
Volume 10, Number 2, March 1999

Contents

Yat Sun Poon .
U(1)-decomposable self-dual manifolds 107

j.lauret
Modified H-type groups and symmetric-like Riemannian spaces 121

Bang-Yen Chen and F Dillen
"Totally real bisectional curvature, Bochner-KaehIer and Einstein-KaehIer manifolds 145

Xi-FangCao
Integral inequalities for maximal spacelike hypersurfaces in the indefinite spacefrom 155

• F. Antonacci, A. Germinario and R. Sampalmieri

Light rays having extreme points with the same spatial coordinates 161
'

p.z. Kobak
Explicit doubly-hermitian metrics 176



JeongHyeongPark
Continuous variation of eigenvalues and Garding's inequality 187

J.F. Carinena and H. Figueroa .
Recursion operators and constants of motion in supermechanics 191

'


The canonical foliation of a compact generalized Hopf manifold

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DIFFERENTIAL GEOMETRY AND ITS APPLICATIONS

Vol.10, NO.3 , May, 1999

contents
in memory of Alfred Gray 203

D.lvansic
Finite-volume hyperbolic 4-manifolds that share a fundamentalpolyhedron 205

R.vitolo
On different geometric formulations of Lagrangian formalism 225

M.A.A KIVIS and v.v goldberg
Semiintegrable almost grassmann structures 257


F.j.Bloore and G.Roberts
The structure of -tensorial cochains of differential operators 295


D.krupka and j.Musilova
Erratum. Trivial lagrangians in field theory 303

Author index, vol. 10 305

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DIFFERENTIAL GEOMETRY AND ITS APPLICATIONS
Volume 11, Number 1, July 1999


Contents

V.Oproiu and N. Papaghiuc
A Kaehier structure on the nonzero tangent bundle of a space form 1

K. Tsukada
The canonical foliation of a compact generalized Hopf manifold 13

H.Tamaru
The local orbit types of symmetric spaces under the actions of theisotropy subgroups 29

C.M. Esche r
On inhomogeneous spherical space forms 39


K.RToä
Pour-dimensional D'Atri Einstein spaces are locally symmet ic 55

H.Baum
LorentziantwistorspinorsandCR-geometry 69