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PSL(2) over Rings of Imaginary Quadratic Integers,l series of arithmetic examples of such groups. This chapter will also fix the notation concerning imaginary quadratic number fields to be used in the following chapters. For the usual facts about algebraic number theory we refer to Lang (1993), Hecke (1923) or Hasse (1964). A useful little table of

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Integral Binary Hermitian Forms,of binary hermitian forms as described for example in Bianchi (1892). Eventually our considerations lead to Humbert’s computation of the covolume of .(2, Thuong) where . is the ring of integers in an imaginary quadratic number field. The work of Humbert on hermitian forms is contained in his papers

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Photodegradation of Foods and Beverages,genpackets for Δ? following Roelcke (1956a), (1966), (1967). Section 2 contains a quick treatment of the theory of eigenpackets. It is included here since nowadays textbooks treat the spectral theory of unbounded operators usually via spectral families.

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