| Autor/es | Trabajo | Página |
| | Coloquio homología y teoría de representaciones. Homenaje al Ing. Orlando E. Villamayor. 9-18 de septiembre 1998. Vaquerías – Córdoba – Argentina. Prólogo. | 5 |
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| | Coloquio homología y teoría de representaciones. Homenaje al Ing. Orlando E. Villamayor. 9-18 de septiembre 1998. Vaquerías – Córdoba – Argentina. Lista de participantes. | 7 |
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| Juan A. Tirao | Orlando Villamayor. | 9 |
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| Max Karoubi | Acto en honor a Orlando E. Villamayor. | 11 |
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| Daniel Zelinsky | The collaboration of Orlando E. Villamayor with Daniel Zelinsky. | 13 |
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| César Carranza | En memoria de Orlando E. Villamayor, 1923-1998. | 21 |
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| J. Alev y F. Dumas | Invited lectures. Corps de Wey Mixtes. | 29 |
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| Nicolás Andruskiewitsch y Hans-Jürgen Schneider | Invited lectures. On the coradical filtration of hopf algebras whose coradical is a hopf subalgebra. Dedicado a la memoria del Ing. Orlando E. Villamayor. | 45 |
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| Marcelo Aguiar | A note on strongly separable algebras. | 51 |
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| B. Bendiffalah y D. Guin | Cohomologie de diagrammes d’algebres triangulaires. | 61 |
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| Claude Cibils | On H1 of finite dimensional algebras. | 73 |
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| Gustavo Corach y A. L. Maestripieri | Positive operators on Hilbert space: a geometrical view point. | 81 |
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| Guillermo Cortiñas | Interchanging homotopy limits and colimits in cat. | 95 |
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| Fernando Cukierman | A note on resultants. | 99 |
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| Jorge A. Devoto | The elliptic cohomology of classifying spaces. | 103 |
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| Eduardo J. Dubuc y Constanza S. de la Vega | On the galois theory of grothendieck. | 111 |
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| Walter Ferrer Santos y Gerardo Gonzalez-Sprinberg | On polynomial invariants. | 137 |
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| Jérôme Germoni | Indecomposable representations of OSP (3,2), D(2,1;α) and G(3). | 147 |
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| Jorge A. Gucciones y Juan J. Guccione | The homology of a crosses product over a localization of k[X]. | 165 |
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| Guy Laffaille | Quantum binomial algebras. | 177 |
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| F. Levstein y D. Penazzi | The icosahedron as a p- and q-polynomial association scheme. | 183 |
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| Augusto Nobile | Equisingular stratifications of parameter spaces of families of embedded curves. | 189 |
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| María Julia Redondo | Cohomologia de Hochschild de algebras de Artin. | 199 |
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| María Julia Redondo y Andrea Solotar | α-Derivations II: the non-conmutative case. | 207 |
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| Jorge A. Vargas | Restriction of discrete series representations to unipotent subgroups. | 217 |
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| Marie-France Vigneras | Dualite pour les representations des groupes reductifs p-adiques et finis. | 225 |
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| Orlando E. Villamayor | Tschirnhausen transformations revisited and the multiplicity of the embedded hypersurface. | 233 |
