## 1990: Vol.: 34 Núm.: 1

### Vol.: 34 Núm.: 1

#### Articles

 Energy machineries on a manifold; application to the construction of new energy representations of gauge groups PDF J. Marion 3-24
 Solving a class of generalized Lyapunov operator differential equations without the exponential operator function PDF L. Jódar 25-35
 Split-null extensions of strongly right bounded rings PDF G. F. Birkenmeier 37-44
 The topological centralizers of Toeplitz flows and their Z_2-extensions PDF W. Bulatek, J. Kwiatkowski 45-65
 Realization of long exact sequences of abelian groups PDF I. S. Pressman 67-76
 Hölder and L^p estimates for the solutions of the $\bar\partial$-equation in non-smooth strictly pseudoconvex domains PDF J. M. Burgués 77-91
 Hyperbolicity in a class of one-dimensional maps PDF G. J. Davis 93-105
 On compact Itô's formulas for martingales of m^4_c PDF M. Jolis 107-128
 The connective K-theory of spinor groups PDF Luis T. Magalhães 129-134
 Subsets of Hardy-class zero sets in the ball PDF P. J. Thomas 135-144
 Weakly additive cohomology PDF E. Espanier 145-150
 Cohomology of Lie groups made discrete PDF Pere Pascual Gainza 151-174
 The Lions's problem for Gustavsson-Peetre functor PDF E. I. Bereznoi, M. Mastylo 175-179
 Fourier Analysis of a space of Hilbert-Schmidt operators-new Ha-plitz type operators PDF Jaak Peetre 181-197
 Conformal and related changes of metric on the product of two almost contact metric manifolds PDF D. E. Blair, J. A. Oubiña 199-207
 Weak dimension of group-graded rings PDF A. del Río 209-216
 Monoid rings that are firs PDF A. Pitarch 217-221
 Addendum to "Polynomial rings over Jacobson-Hilbert rings" PDF C. Faith 223-223