By Sergio Albeverio; Ludwig Streit; et al (eds.)

Masafumi Akahira and Kei Takeuchi have collaborated in examine on mathematical records for almost thirty years and feature released many articles and papers. This quantity is a set in their papers, a few released in famous and others in lesser-known journals. The papers hide quite a few fields, however the major topic is the speculation of estimation -- asymptotic, non-regular, sequential, and so forth. the entire papers are theoretical in nature, yet have implications for utilized difficulties

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**Extra info for Mathematical physics and stochastic analysis : essays in honour of Ludwig Streit**

**Example text**

26) ^2PI - x! 27) then operator V is a bounded operator with V = V and the total hamiltonian H is selfadjoind on D(H0). 3 The Stochastic Limit The stochastic limit is now widely used in the consideration of the large time/weak coupling behaviour of quantum dynamical systems, see for example 5 Let be given a quantum system described by the Hamiltonian H = H0 + XV where A is the coupling constant. The starting point of the stochastic limit is the equation for the evolution operator in interaction picture where V(t) = e«"oVe-itH0 The main idea is that there exists a new quantum field (master field) and a new evolution operator U{t) (they both live in a new Hilbert space) which approximates the old one U(x){t)KU{\2t) and the approximation is meant in the sense of appropriately chosen matrix elements.

30) Here g(k,p) is a test function and e(p) and w(k) are one-particle dispersion laws, for example e(p) = p 2 /2, u(k) = \k\. 33) is the corresponding energy. 34) we apply Wick's theorem. Each vertex contains 3 lines. The lines attached to vertex i are characterized by two momenta (fcj,p<). We find the momentum corresponding to the 3rd line using the momentum con servation. Let a diagram consists on N connected parts. Denote numbers of external lines coming in (coming out) n-connected part as An(Bn)- We have Y2n An — n~, ^2n Bn = n+.

In recent years Ludwig has done outstanding work in the study of Donskers function and the intersection functionals of Brownian motions ([98], [105], [108], [120], [124], [127]). 6 Infinite dimensional analysis and applications Ludwig was an initiator and an essential motor in the development of a dis tribution theory on infinite dimensional spaces (Gaussian and non Gaussian white noise calculus), and its applications to differential and variational calcu lus on infinite dimensional spaces, see [36], [40], [46], [47], [81], [83], [85], [90], [92], [99]-[104], [106], [111]-[118], [121], [126] (and T.