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1: 1.6 Vectors and Vector-Valued Functions
Del Operator
1.6.19 = 𝐢 x + 𝐣 y + 𝐤 z .
2: Mathematical Introduction
complex plane (excluding infinity).
(or x ) backward difference operator: f ( x ) = f ( x ) f ( x 1 ) . (See also del operator in the Notations section.)
3: Bibliography L
  • A. Laforgia (1979) On the Zeros of the Derivative of Bessel Functions of Second Kind. Pubblicazioni Serie III [Publication Series III], Vol. 179, Istituto per le Applicazioni del Calcolo “Mauro Picone” (IAC), Rome.
  • L. Lapointe and L. Vinet (1996) Exact operator solution of the Calogero-Sutherland model. Comm. Math. Phys. 178 (2), pp. 425–452.
  • B. M. Levitan and I. S. Sargsjan (1975) Introduction to spectral theory: selfadjoint ordinary differential operators. Translations of Mathematical Monographs, Vol. 39, American Mathematical Society, Providence, R.I..