Abstract
The main result in this chapter is a theorem in [1] on the extension of isometries φ: V →V between ⊥-closed subspaces of a sesquilinear space E (Theorems 5 and 9 below).
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Gross, H. (1979). Extension of Isometries. In: Quadratic Forms in Infinite Dimensional Vector Spaces. Progress in Mathematics, vol 1. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-1454-8_11
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DOI: https://doi.org/10.1007/978-1-4757-1454-8_11
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