Abstract
Quadratic forms and their use in linear algebra are quite well known. A natural extension of these ideas in finite- and infinite-dimensional spaces leads us to the numerical range.
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Notes and References
Notes and References for Section 1.1
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Notes and References for Section 1.4
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Notes and References for Section 1.5
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Notes and References for Section 1.6
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Gustafson, K.E., Rao, D.K.M. (1997). Numerical Range. In: Numerical Range. Universitext. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-8498-4_1
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