On Exceptional Completions of Symmetric Varieties
Journal of Lie Theory, Tome 16 (2006) no. 1, pp. 39-46

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Let $G$ be a simple group with an exceptional involution $\sigma$ having $H$ as fixed point set. We study the embedding of $G/H$ in the projective space ${\mathbb P}(V)$ for a simple $G$--module $V$ with a line fixed by $H$ but having no nonzero vector fixed by $H$. For a certain class of such modules $V$ we describe the closure of $G/H$ proving in particular that it is a smooth variety.
Classification : 14M17, 14L30
Mots-clés : Complete symmetric variety, exceptional involution

Rocco Chirivì  1   ; Andrea Maffei  2

1 Dip. di Matematica, Università di Pisa, Via Buonarroti 2, 56127 Pisa, Italy
2 Dip. di Matematica, Università di Roma "La Sapienza", P.le Aldo Moro 5, 00185 Roma, Italy
Rocco Chirivì; Andrea Maffei. On Exceptional Completions of Symmetric Varieties. Journal of Lie Theory, Tome 16 (2006) no. 1, pp. 39-46. http://geodesic.mathdoc.fr/item/JOLT_2006_16_1_a2/
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     author = {Rocco Chiriv{\`\i} and Andrea Maffei},
     title = {On {Exceptional} {Completions} of {Symmetric} {Varieties}},
     journal = {Journal of Lie Theory},
     pages = {39--46},
     year = {2006},
     volume = {16},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2006_16_1_a2/}
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