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  2. Spectrum (functional analysis) - Wikipedia

    en.wikipedia.org/wiki/Spectrum_(functional_analysis)

    In mathematics, particularly in functional analysis, the spectrum of a bounded linear operator (or, more generally, an unbounded linear operator) is a generalisation of the set of eigenvalues of a matrix.

  3. Spectral theory - Wikipedia

    en.wikipedia.org/wiki/Spectral_theory

    The spectrum of T is the set of all complex numbers ζ such that R ζ fails to exist or is unbounded. Often the spectrum of T is denoted by σ(T). The function R ζ for all ζ in ρ(T) (that is, wherever R ζ exists as a bounded operator) is called the resolvent of T. The spectrum of T is therefore the complement of the resolvent set of T in ...

  4. Decomposition of spectrum (functional analysis) - Wikipedia

    en.wikipedia.org/wiki/Decomposition_of_spectrum...

    The spectrum of T restricted to H ac is called the absolutely continuous spectrum of T, σ ac (T). The spectrum of T restricted to H sc is called its singular spectrum, σ sc (T). The set of eigenvalues of T is called the pure point spectrum of T, σ pp (T). The closure of the eigenvalues is the spectrum of T restricted to H pp.

  5. Essential spectrum - Wikipedia

    en.wikipedia.org/wiki/Essential_spectrum

    In mathematics, the essential spectrum of a bounded operator (or, more generally, of a densely defined closed linear operator) is a certain subset of its spectrum, defined by a condition of the type that says, roughly speaking, "fails badly to be invertible".

  6. List of primary education systems by country - Wikipedia

    en.wikipedia.org/wiki/List_of_primary_education...

    Subjects usually taken up include Communication Arts in Mother Tongue (until Grade 3), English (some private schools break this down into Language and Reading) and Filipino, Mathematics, Science, Social Studies (taught in Mother Tongue from Grade 1-Grade 3, Filipino in Grades 4-6), Music, Art, Physical Education and Health (collectively known ...

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  9. 2 dead in Kamaka Air plane crash near Honolulu Airport during ...

    www.aol.com/2-dead-plane-crashed-building...

    Two people are dead after a plane crashed into a building near the Daniel K. Inouye International Airport in Honolulu, according to reports. At around 3:15 p.m. local time on Tuesday, Kamaka Air ...

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