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• Green's function (many-body theory) — In many body theory, the term Green s function (or Green function) is sometimes used interchangeably with correlation function, but refers specifically to correlators of field operators or creation and annihilation operators.The name comes from… …   Wikipedia

• Essential spectrum — In mathematics, the essential spectrum of a bounded operator is a certain subset of its spectrum, defined by a condition of the type that says, roughly speaking, fails badly to be invertible .The essential spectrum of self adjoint operatorsIn… …   Wikipedia

• IMAGINES — I. IMAGINES in Gentilium religione multi usûs, qui tamen non apud omnes eorum semper viguit. Nam fuêre, qui urcumque Numina colentes varia, aut Solem saltem sub variis nominibus, neque atas, neque statuas Imag insque ullas eorum hab uêre, nec… …   Hofmann J. Lexicon universale