difference operator

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• Difference operator — In mathematics, a difference operator maps a function, f ( x ), to another function, f ( x + a ) − f ( x + b ).The forward difference operator :Delta f(x)=f(x+1) f(x),occurs frequently in the calculus of finite differences, where it plays a role… …   Wikipedia

• Difference polynomials — In mathematics, in the area of complex analysis, the general difference polynomials are a polynomial sequence, a certain subclass of the Sheffer polynomials, which include the Newton polynomials, Selberg s polynomials, and the Stirling… …   Wikipedia

• Operator messaging — is the term, similar to Text Messaging and Voice Messaging, applying to an answering service call center who focuses on one specific scripting style that has grown out of the alphanumeric pager history. Contents 1 Early history 2 Message Center… …   Wikipedia

• Operator (sternwheeler) — Operator on Skeena River 1911 Career (Canada) …   Wikipedia

• Difference of Gaussian — Helligkeitsänderung einer Kante Verlauf der 2. Ableitung an der Kante Der Marr Hildreth Operator oder Laplacian of Gaussian (LoG) ist eine spezielle Form eines diskreten Laplace Filters …   Deutsch Wikipedia

• Difference of Gaussians — In computer vision, Difference of Gaussians is a grayscale image enhancement algorithm that involves the subtraction of one blurred version of an original grayscale image from another, less blurred version of the original. The blurred images are… …   Wikipedia

• Operator product expansion — Contents 1 2D Euclidean quantum field theory 2 General 3 See also 4 External links 2D Euclidean quantum field theory …   Wikipedia

• Difference Engine — ▪ calculating machine       an early calculating machine, verging on being the first computer, designed and partially built during the 1820s and 30s by Charles Babbage (Babbage, Charles). Babbage was an English mathematician and inventor; he… …   Universalium

• Finite difference — A finite difference is a mathematical expression of the form f(x + b) − f(x + a). If a finite difference is divided by b − a, one gets a difference quotient. The approximation of derivatives by finite differences… …   Wikipedia

• Delta operator — In mathematics, a delta operator is a shift equivariant linear operator on the vector space of polynomials in a variable over a field that reduces degrees by one. To say that is shift equivariant means that if …   Wikipedia

• Lag operator — In time series analysis, the lag operator or backshift operator operates on an element of a time series to produce the previous element. For example, given some time series:X= {X 1, X 2, dots },then :, L X t = X {t 1} for all ; t > 1,where L is… …   Wikipedia