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We found 3 dictionaries that define the word spectral theory:

General (2 matching dictionaries)
  1. spectral theory: Wiktionary
  2. Spectral theory: Wikipedia, the Free Encyclopedia

Science (1 matching dictionary)
  1. Spectral Theory: Eric Weisstein's World of Mathematics

Definitions from Wiktionary (spectral theory)

noun:  (mathematics) Those theories extending the eigenvalue and eigenvector theory of a single square matrix to a much broader theory of the structure of operators in a variety of mathematical spaces.

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