Some Extensions of Witt's Theorem

Details Some Extensions of Witt's Theorem Some Extensions of Witt's Theorem

2007-05-25

arxiv.org/abs/0705.3839v1

Mathematics

Algebraic Geometry

Scientific paper

We extend Witt's theorem to several kinds of simultaneous isometries of subspaces. We determine sufficient and necessary conditions for the extension of an isometry of subspaces $\phi:E\to E'$ to an isometry $\phi_V:V\to V'$ that also sends a given subspace to another, or a given self-dual flag to another, or a Witt's decomposition to another and a special self-dual flag to another. We also determine sufficient and necessary conditions for the isometry of generic flags or the simultaneous isometry of (subspace, self-dual flag) pairs.

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