By T. Aoki, H. Majima, Y. Takei, N. Tose

ISBN-10: 443173239X

ISBN-13: 9784431732396

This quantity comprises 23 articles on algebraic research of differential equations and similar issues, so much of that have been awarded as papers on the foreign convention ''Algebraic research of Differential Equations вЂ“ from Microlocal research to Exponential Asymptotics'' at Kyoto collage in 2005. Microlocal research and exponential asymptotics are in detail hooked up and supply strong instruments which have been utilized to linear and non-linear differential equations in addition to many similar fields reminiscent of genuine and intricate research, imperative transforms, spectral conception, inverse difficulties, integrable platforms, and mathematical physics. The articles contained right here current many new effects and concepts, offering researchers and scholars with beneficial feedback and instructive assistance for his or her paintings. This quantity is devoted to Professor Takahiro Kawai, who's one of many creators of microlocal research and who brought the means of microlocal research into exponential asymptotics. This commitment is made at the social gathering of Professor Kawai's sixtieth birthday as a token of deep appreciation of the $64000 contributions he has made to the sector. Introductory notes at the medical works of Professor Kawai also are included.

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699–726. [V] A. Voros: The return of the quartic oscillator. The complex WKB method, Ann. Inst. Henri Poincar´e, 39(1983), 211–338. [Z] J. Zinn-Justin: Instantons in quantum mechanics: Numerical evidence for a conjecture, J. Math. , 25(1984), 549–555. , Asagaya-kita 2-13-2, Suginami-ku, Tokyo 166-0001, Japan Mitsubishi UFJ Securities Co. , Marunouchi 2-4-1, Chiyoda-ku, Tokyo 100-6317, Japan Department of Physics, Graduate School of Science, Tokyo Metropolitan University, Hachioji 192-0397, Japan Research Institute for Mathematical Sciences, Kyoto University, Kyoto 606-8502, Japan Summary.

Fig. 5. The Stokes geometry of the BNR operator for (i) arg η = 1 1 ( 12 − 12 )π, (ii) arg η = 12 π and (iii) arg η = ( 12 + 12 )π. The bifurcation of a Stokes curve observed in Fig. 5 (ii) is due to the singularity that the direction ﬁeld (1) acquires at a simple turning point. Impressively enough, the smooth transition between Fig. 5 (i) and Fig. 5 (iii) via Fig. 5 (ii) is attained with the addition of Stokes curves emanating from the virtual turning point x = 0. One should observe some clumsy transition if they were not added.

Let R be a commutative ring with unit. Let a0 , a1 , . . , al be elements of R. Deﬁnition 3. The sequence a0 , a1 , . . , al is called a regular sequence if the following two conditions hold: 1. For any k = 0, . . , l, the element ak is not a zero divisor on R/(a0 , . . , ak−1 ). 2. (a0 , . . , al ) = R. Note that the notion of regular sequences depends on the ordering of a0 , a1 , . . , al . Deﬁnition 4. The sequence a0 , a1 , . . , al is called a tame regular sequence if for any k = 0, .

### Algebraic Analysis of Differential Equations: from Microlocal Analysis to Exponential Asymptotics by T. Aoki, H. Majima, Y. Takei, N. Tose

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