Infinite Dimensional Stochastic Analysis: In Honor of by Ambar N. Sengupta, P Sundar

By Ambar N. Sengupta, P Sundar

This quantity comprises present paintings on the frontiers of study in limitless dimensional stochastic research. It offers a gently selected selection of articles via specialists to focus on the newest advancements in white noise conception, endless dimensional transforms, quantum likelihood, stochastic partial differential equations, and functions to mathematical finance. incorporated during this quantity are expository papers so one can aid bring up conversation among researchers operating in those components. The instruments and strategies offered right here may be of serious price to analyze mathematicians, graduate scholars and utilized mathematicians.

Contents: complicated White Noise and the limitless Dimensional Unitary team (T Hida); advanced Itô formulation (M Redfern); White Noise research: history and a up to date software (J Becnel & A N Sengupta); chance Measures with Sub-Additive vital Szegö Jacobi Parameters (A Stan); Donsker's useful Calculus and similar Questions (P-L Chow & J Potthoff); Stochastic research of Tidal Dynamics Equation (U Manna et al.); tailored suggestions to the Backward Stochastic Navier Stokes Equations in 3D (P Sundar & H Yin); areas of try out and Generalized features of Arcsine White Noise formulation (A Barhoumi et al.); an unlimited Dimensional Fourier Mehler remodel and the Lévy Laplacian (K Saito & okay Sakabe); the warmth Operator in limitless Dimensions (B C Hall); Quantum Stochastic Dilation of Symmetric Covariant thoroughly optimistic Semigroups with Unbounded Generator (D Goswami & ok B Sinha); White Noise research within the thought of Three-Manifold Quantum Invariants (A Hahn); a brand new specific formulation for the answer of the Black Merton Scholes Equation (J A Goldstein et al.); Volatility versions of the Yield Curve (V Goodman).

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Additional info for Infinite Dimensional Stochastic Analysis: In Honor of Hui-Hsiung Kuo (QP--PQ: Quantum Probability and White Noise Analysis)

Example text

The approach is well known from classical sensitivity analyses. We see that if IiB is large, a small change in the reliability of component i will give a relatively large change in system reliability. Birnbaum’s measure might be appropriate, for example, in the operation phase where possible improvement actions are related to operation and maintenance parameters. Before looking closer into specific improvement actions of the components, it will be informative to measure the sensitivity of the system reliability with respect to small changes in the reliability of the components.

However, this IFR property is in some cases too strong and other intuitive notions of aging have been suggested. Among them are the increasing failure rate average (IFRA) property and the notions of new better than used (NBU) and new better than 38 2. Basic Reliability Theory used in expectation (NBUE). In the following subsection these concepts are introduced formally and the relationships among them are investigated. Furthermore, these notions should be applied to complex systems. If we consider the time dynamics of such systems, we want to investigate how the reliability of the whole system changes in time if the components have one of the mentioned aging properties.

Taking the limit u → 0− we have Λ(0−) = 0 and Λ(αt) ≤ αΛ(t), which amounts to F¯ (αt) ≥ (F¯ (t))α . But this is equivalent to the IFRA property (see Remark 1 above). F IFRA⇒ F NBU: With the abbreviations a = −(1/x) ln F¯ (x) and b = −(1/y) ln F¯ (y) we obtain from the IFRA property for positive x, y that −(1/(x + y)) ln F¯ (x + y) ≥ a ∨ b = max{a, b} and − ln F¯ (x + y) ≥ (a ∨ b)(x + y) ≥ ax + by = − ln F¯ (x) − ln F¯ (y). But this is the NBU property F¯ (x + y) ≤ F¯ (x)F¯ (y). F NBU⇒ F NBUE: This inequality follows by integrating the NBU inequality ∞ F¯ (t)µ(t) = 0 F¯ (x + t)dx ≤ F¯ (t) ∞ F¯ (x)dx = F¯ (t)µ, 0 which completes the proof.

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