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Propagation of analytic singularities for second order Dirichlet problems. II. (English) Zbl 0534.35030
This is the second of three papers [part I, ibid., 41-94 (1980; Zbl 0458.35026), part III, ibid. 6, 499-567 (1981; Zbl 0524.35032) on propagation of analytic singularities for second order Dirichlet problems, with particular emphasis on the diffractive region. Through a point \(\rho_ 0\) of the diffractive region there passes the boundary bicharacteristic \(\gamma_ 0(t)\) and the \(C^{\infty}\) ray \(\alpha_ 0(t)\), defined in [R. B. Melrose and J. Sjoestrand, Commun. Pure Appl. Math. 35, 129-168 (1982)]. One considers the forward and backward half of each: for \(0<t\leq \delta_ 0,\gamma_ 1(t)=\gamma_ 0(-t),\gamma_ 2(t)=\gamma_ 0(t),\gamma_ 3(t)=\alpha_ 0(- t),\gamma_ 4(t)=\alpha_ 0(t).\) For \(\partial \Omega\) noncharacteristic for P, Pu analytic, \(u|_{\partial \Omega}\) analytic and two further technical conditions, it is shown that if \(\gamma_ 1(t)\), \(\gamma_ 2(t)\not\in WF_{ba}(u)\), \(\gamma_ 0\not\in WF_{ba}(u)\), where \(WF_{ba}(u)\) is the analytic wave front set at the boundary. In part III, other possible combinations of \(\gamma_ j(t)\not\in WF_{ba}(u)\) are settled-two affirmatively and one negative.
Reviewer: R.Johnson

35J15 Second-order elliptic equations
35A20 Analyticity in context of PDEs
58J47 Propagation of singularities; initial value problems on manifolds
35A30 Geometric theory, characteristics, transformations in context of PDEs
58J40 Pseudodifferential and Fourier integral operators on manifolds
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