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Get An Introduction to Harmonic Analysis on Semisimple Lie PDF

By V. S. Varadarajan

ISBN-10: 0521341566

ISBN-13: 9780521341561

Now in paperback, this graduate-level textbook is a wonderful creation to the illustration idea of semi-simple Lie teams. Professor Varadarajan emphasizes the advance of primary subject matters within the context of distinct examples. He starts off with an account of compact teams and discusses the Harish-Chandra modules of SL(2,R) and SL(2,C). next chapters introduce the Plancherel formulation and Schwartz areas, and exhibit how those bring about the Harish-Chandra concept of Eisenstein integrals. the ultimate sections contemplate the irreducible characters of semi-simple Lie teams, and comprise specific calculations of SL(2,R). The ebook concludes with appendices sketching a few uncomplicated issues and with a accomplished consultant to extra analyzing. This extraordinary quantity is extremely appropriate for college kids in algebra and research, and for mathematicians requiring a readable account of the subject.

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Extra resources for An Introduction to Harmonic Analysis on Semisimple Lie Groups

Example text

9. Modello matematico del piano (a sinistra) e dello spazio (a destra) 24 1 Nozioni di base Il concetto di prodotto cartesiano pu`o essere generalizzato al caso di pi` u di due insiemi. Precisamente, dati n insiemi non vuoti X1 , X2 , . . , Xn , formiamo le n−uple ordinate (x1 , x2 , . . , xn ) scegliendo ordinatamente, per i = 1, 2, . . , n, ciascuna componente xi nell’insieme Xi . Il prodotto cartesiano X1 × X2 × . . × Xn `e costituito dall’insieme di tutte queste n−uple. Se X1 = X2 = . .

Infatti, f (x1 ) = f (x2 ) ⇒ x31 − x32 = (x1 − x2 )(x21 + x1 x2 + x22 ) = 0 ⇒ x1 = x2 in quanto x21 + x1 x2 + x22 = 1 2 2 2 e la 2 [x1 + x2 + (x1 + x2 ) ] > 0 qualunque siano x1 = x2 . La funzione inversa ` √ 3 ✷ funzione ‘radice cubica’ y = x definita su tutto R. Osserviamo che, come fatto nell’esempio ii) precedente, se una funzione f non `e iniettiva su tutto il suo dominio, lo pu`o essere su un sottoinsieme A ⊆ dom f . La restrizione di f ad A, cio`e la funzione f |A : A → Y tale che f|A (x) = f (x) , ∀x ∈ A , risulta quindi invertibile.

X∈A Se sup f (x) `e finito ed appartiene ad f (A), allora esso `e il massimo di questo x∈A insieme. Tale numero viene detto il valore massimo (o semplicemente il massimo) di f su A e indicato con max f (x). x∈A I concetti di estremo inferiore e di minimo di f su A sono definiti in modo analogo. Infine, f dicesi limitata su A se l’insieme f (A) `e limitato. Talvolta si usano le notazioni pi` u sintetiche supA f, maxA f , etc. Notiamo che il valore massimo M = maxA f di f sull’insieme A `e caratterizzato dalle seguenti condizioni: i) M `e un valore assunto dalla funzione su A, cio`e esiste xM ∈ A tale che f (xM ) = M ; ii) M `e maggiore o uguale a ogni altro valore assunto dalla funzione su A, cio`e per ogni x ∈ A, f (x) ≤ M.

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An Introduction to Harmonic Analysis on Semisimple Lie Groups by V. S. Varadarajan


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