(Updated, April 19, 2013)
火曜日16:30 -- 18:00, 於: 東京大学大学院数理科学研究科棟(駒場)
1階128号室
幹事: 片岡清臣 , 俣野博
Tel & FAX 03-5465-7029 (K. KATAOKA), 03-5465-7037(H. MATANO)
世話人: 片岡清臣,俣野 博,中村 周,下村 明洋
注意:2007年4月から部屋が変わっています!
(代数解析関係は2004年度より代数解析火曜セミナーとしてこれとは別になりました.ただし時間帯・部屋は共用し原則的に交代で開催します.)
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東京大学解析学公開講座1997,東京大学解析学公開講座2001(updated
2003.9)).
2013年5月21日(火):16:30~18:00
講師: 上坂 正晃 氏 (東大数理)
題目: Homogenization in a Thin Layer with an Oscillating Interface and Highly Contrast Coefficients
Abstract: We consider the homogenization problem of the elliptic boundary value problem in a thin domain which has a high and low conductivity zones. In our model, two media
are separated by a highly oscillating interface. The asymptotic behavior is governed by the order of the thickness of the domain, oscillation period of the interface and contrast between two media. In this talk, we show that the limit problem is changed by these parameters. We also introduce the two-scale convergence result in a thin domain which is the key ingredient of the proof.
2012年12月4日(火):16:30~18:30
1. 講師: Alexander Vasiliev 氏 (Department of Mathematics, University
of Bergen, Norway)
題目: Evolution of smooth shapes and the KP hierarchy
2. 講師: Irina Markina 氏 (Department of Mathematics, University
of Bergen, Norway)
題目: Group of diffeomorphisms of the unit circle and sub-Riemannian
geometry
Abstract1: We consider a homotopic evolution in the space
of smooth
shapes starting from the unit circle. Based on the Loewner-Kufarev
equation we give a Hamiltonian formulation of this evolution and
provide conservation laws. The symmetries of the evolution are
given
by the Virasoro algebra. The 'positive' Virasoro generators span
the
holomorphic part of the complexified vector bundle over the space
of
conformal embeddings of the unit disk into the complex plane and
smooth on the boundary. In the covariant formulation they are
conserved along the Hamiltonian flow. The 'negative' Virasoro
generators can be recovered by an iterative method making use
of the
canonical Poisson structure. We study an embedding of the
Loewner-Kufarev trajectories into the Segal-Wilson Grassmannian,
construct the tau-function, the Baker-Akhiezer function, and finally,
give a class of solutions to the KP hierarchy, which are invariant
on
Loewner-Kufarev trajectories.
Abstract2: We consider the group of sense-preserving diffeomorphisms
of the unit
circle and its central extension - the Virasoro-Bott group as
sub-Riemannian manifolds. Shortly, a sub-Riemannian manifold is
a
smooth manifold M with a given sub-bundle D of the tangent bundle,
and
with a metric defined on the sub-bundle D. The different sub-bundles
on considered groups are related to some spaces of normalized
univalent functions. We present formulas for geodesics for different
choices of metrics. The geodesic equations are generalizations
of
Camassa-Holm, Huter-Saxton, KdV, and other known non-linear PDEs.
We
show that any two points in these groups can be connected by a
curve
tangent to the chosen sub-bundle. We also discuss the similarities
and
peculiarities of the structure of sub-Riemannian geodesics on
infinite
and finite dimensional manifolds.
2012年11月6日(火):16:30~18:00
講師: Thierry Ramond 氏 (Univ. Paris, Orsay)
題目: Resonance free domains for homoclinic orbits
2012年10月30日(火):16:30~18:00
講師: Francis Nier 氏 (Univ. Rennes 1)
題目: About the method of characteristics
Abstract: While studying the mean field dynamics of a systems
of bosons,
one is led to solve a transport equation for a probability measure
in an infinite
dimensional phase-space. Since those probability measures are
characterized
after testing with cylindrical or polynomial observables, which
make classes
which are not invariant after composing with a nonlinear flow.
Thus the standard
method of characteristics for transport equations cannot be extended
at once
to the infinite dimensional case. A solution comes from techniques
developed
for optimal transport and a probabilistic interpretation of trajectories.
2012年10月23日(火):16:30~18:00 この日のみ(駒場) 1階002号室
講師: Elliott Lieb 氏 (Princeton Univ.)
題目: Topics in quantum entropy and entanglement
Abstract: Several recent results on quantum entropy and the uncertainty
principle will be discussed. This is partly joint work with Eric
Carlen
on lower bounds for entanglement, which has no classical analog,
in terms
of the negative of the conditional entropy, S1 - S12, whose negativity,
when it occurs, also has no classical analog. (see arXiv:1203.4719)
It is also partly joint work with Rupert Frank on the uncertaintly
principle for quantum entropy which compares the quantum von
Neumann
entropy with the classical entropies with respect to two different
bases. We prove an extension to the product of two and three spaces,
which
has applications in quantum information theory. (see arxiv:1204.0825)
2012年7月17日(火):16:30~18:00
講師: 菅 徹 氏(東北大学)
題目: 2次元円環領域におけるLiouville-Gel'fand方程式の非球対称解の構造
Abstract: 指数関数を非線形項に持つ非線形楕円型方程式(Liouville-Gel'fand方程式)
について考察する。特に2次元の円環領域では、この方程式の非球対称な解が球対称解
から分岐する形で現れる。本講演では、この分岐解の分岐図上での大域的な構造に関
して得られた結果を紹介する。
2012年7月10日(火):16:30~18:00
講師: 牛越 惠理佳 氏(東北大学)
題目: Hadamard variational formula for the Green function
of the Stokes equations with the boundary condition
Abstract: 本講演では、遅い非圧縮粘性流体の運動を記述したStokes
方程式におけるHadamard変分公式の導出について考察する。ここで、
Hadamard変分公式とは、1908年にHadamardによって提唱された、
領域にある摂動をさせた時に、Green函数に代表される領域に依存す
る函数が、どのような摂動をするのかを表現したものである。
変分公式は、領域摂動に伴う固有値の漸近挙動を明示的に表現した
Weylの漸近公式と関連があるなど、領域摂動問題において大変有用な
ものとして導出されてきた。本講演において、まずは導入として、楕円
型方程式で最も基本的なラプラス方程式のDirichlet問題に対する変分公
式について言及し、その後に主結果であるStokes方程式における
Hadamard変分公式について述べる。
2012年6月26日(火):16:30~18:00
講師: 伊藤 健一 氏(筑波大学)
題目: Absence of embedded eigenvalues for the Schr\"odinger
operator on manifold with ends
Abstract: We consider a Riemannian manifold with, at least, one
expanding end, and prove the absence of $L^2$-eigenvalues for
the Schr\"odinger operator above some critical value. The
critical
value is computed from the volume growth rate of the end and the
potential behavior at infinity. The end structure is formulated
abstractly in terms of some convex function, and the examples
include asymptotically Euclidean and hyperbolic ends. The proof
consists of a priori superexponential decay estimate for eigenfunctions
and the absence of superexponentially decaying eigenfunctions,
both of which employs the Mourre-type commutator argument. This
talk
is based on the recent joint work with E.Skibsted (Aarhus University).
2012年5月22日(火):16:30~18:00 at 118*
講師: Norbert Pozar 氏 (東大数理)
題目:Viscosity solutions for nonlinear elliptic-parabolic problems
Abstract: ハWe introduce a notion of viscosity solutions for a
general class of
elliptic-parabolic phase transition problems. These include the
Richards equation, which is a classical model in filtration theory.
Existence and uniqueness results are proved via the comparison
principle. In particular, we show existence and stability properties
of maximal and minimal viscosity solutions for a general class
of
initial data. These results are new even in the linear case, where
we
also show that viscosity solutions coincide with the regular weak
solutions introduced in [Alt&Luckhaus 1983]. This talk is
based on a
recent work with Inwon Kim.
(この日だけ部屋が118になります.お間違えのないように!)
2012年5月15日(火):16:30~18:00
講師: 水谷 治哉 氏(京都大学・数理解析研究所)
題目: Strichartz estimates for Schr\"odinger equations with
variable
coefficients and unbounded electromagnetic potentials
Abstract:In this talk we consider the Cauchy problem for Schr\"odinger
equations with variable coefficients and unbounded potentials.
Under the
assumption that the Hamiltonian is a long-range perturbation of
the free
Schr\"odinger operator, we construct an outgoing parametrix
for the
propagator near infinity, and give applications to sharp Strichartz
estimates.
The basic idea is to combine the standard approximation by using
a time
dependent modifier, which is not in the semiclassical regime,
with the
semiclassical approximation of Isozaki-Kitada type. We also show
near
sharp Strichartz estimates without asymptotic conditions by using
local
smoothing effects.
2012年2月14日(火):16:30~18:00
講師: Michael Loss 氏 (Georgia Institute of Technology)
題目: Symmetry results
for Caffarelli-Kohn-Nirenberg inequalities
2012年1月31日(火):16:30~18:00
講師: Michel Chipot 氏 (University of Zurich)
題目: Obstacle problems in unbounded domains
Abstract:We will present a formulation of obstacle problems in
unbounded
domains when the energy method does not work, i.e. whenthe force
does
not belong to ハH^{-1}.
2011年12月20日(火):16:30~18:00
講師: Gueorgui Raykov 氏 (チリ・カソリック大学)
題目: A trace formula for the perturbed Landau Hamiltonian
Abstract: The talk will be based on a joint work with A. Pushnitski
and C. Villegas-Blas, the preprint is available here:
http://arxiv.org/abs/1110.3098 .
2011年12月13日(火):16:30~18:00
講師:Wolfram Bauer氏 (ゲッチンゲン大学)
題目: Trivializable
subriemannian structures and spectral analysis of associated operators
2011年11月8日(火):16:30~18:00
講師: 寺澤 祐高 氏 (東京大数理(日本学術振興会特別研究員PD))
題目: 確率的摂動項を持つ冪乗法則流体方程式の弱解の存在と 一意性について
Abstract: 本講演では、非圧縮性非ニュートン流体の運動を記述する
偏微分方程式に加法的確率的摂動項を加えた確率偏微分方程式 の弱解
の存在と一意性について考察する。 非ニュートン流体としては、粘性
が変形速度テンソルの大きさの冪乗 の形で依存する冪乗法則流体を考
察し、確率的摂動項としては 有色雑音を考察する。 Necas-Malek-
Ruzicka('93)において、確率的外力項を伴わない、 決定方程式に関し
て示された弱解の存在と一意性の主張を、 確率的摂動項を持つ方程式
に対して示す。 解の存在の証明は、ガレルキン近似によって得られた
解の列に対して、 伊藤の公式、Birkholder-Davis-Gundyの不等式など
により、 解の列のコンパクト性を示すこと及び、解の部分列が収束し
、 その収束先が方程式を弱い意味で満たすことを示すことでなされる。
なお、本講演は、吉田伸生氏(京都大学)との共同研究に基づく。
2011年10月11日(火):16:30~18:00
講師: 和田出 秀光 氏 (早稲田大学(日本学術振興会特別研究員PD))
題目: 重み付きTrudinger-Moser型不等式の最良定数に関して
Abstract: 同講演では、斉次重み付きTrudinger-Moser型不等式を
最良定数と共に考察する。
重みなしの場合は、 Adachi -Tanaka, Proc. Amer. Math. Soc. (1999),
により全空間上のスケール不変なTrudinger-Moser型不等式が
最良定数と共に導出されており、我々は重み付きTrudinger-Moser型
不等式への拡張を試みる。
更に、重み付きTrudinger-Moser型不等式の偏微分方程式への
応用として、重み付き指数型非線形項を伴うKlein-Gordon方程式を
2次元で考察し、同方程式の局所解及び大域解の存在を証明する。
2011年7月12日(火):16:30~18:00
講師: 小林 政晴 氏 (東京理科大学)
題目: The inclusion relation between Sobolev and modulation spaces
Abstract: In this talk, we consider the inclusion relations between
the $L^p$-Sobolev spaces and the modulation spaces. As an application,
we give mapping properties of unimodular Fourier multiplier $e^{i|D|^\alpha}$
between $L^p$-Sobolev spaces and modulation spaces.
Joint work with Mitsuru Sugimoto (Nagoya University).
2011年4月26日(火):16:30~18:00
講師: 片岡 清臣 氏(東京大数理)
題目: On the system of fifth-order differential equations which
describes surfaces containing six continuous families of circles
11月16日(火)と20日(土)〜21日(日)に東京大学数理科学研究科に
L. Boutet de Monvel先生(University of Paris 6)と
Michael Ruzhansky先生(Imperial College London)をお招きして、
GCOE後援の国際研究集会
「Microlocal analysis and partial differential equations」
を開催します。プログラムはこちらです。(japanese,
english)
****皆様のご参加を大歓迎します。
2010年9月28日(火):16:30~18:00
講師: Pavel Exner 氏(Czech Academy of Sciences)
題目: Some spectral and resonance properties of quantum graphs
Abstract: In this talk I will discuss three new results about
Schr¨odinger operators
on metric graphs obtained in collaboration with Jiri Lipovskyand
Brian Davies.
The first one is related to invalidity of the uniform continuation
principle for such
operators. One manifestation of this fact are embedded eigenvalues
due to
rational relations of graph edge lengths. This effect is non-generic
and we show
how geometric perturbations turn these embedded eigenvalues into
resonances.
Then second problem is related to high-energy behavior of resonances:
we extend
a recent result of Davies and Pushnitski to graphs with general
vertex couplings
and find conditions under which the asymptotics does not have
Weyl character.
Finally, the last question addressed here concerns the absolutely
continuous spectrum
of radial-tree graphs. In a similar vein, we generalize a recent
result by Breuer and
Frank that in case of the free (or Kirhhoff) coupling the ac spectrum
is absent
provided the edge length are increasing without a bound along
the tree.
We show that the result remains valid for a large class of vertex
couplings,
but on the other hand, there are nontrivial couplings leading
to an ac spectrum.
2010年7月13日(火):17:00~18:00
講師: Carlos Villegas Blas 氏(メキシコ国立自治大学)
題目:On a limiting eigenvalue distribution theorem for perturbations
of the hydrogen atom
Abstract: Let H be the hydrogen atom Hamiltonian. ハWe will show
that
the operator H+P can have well defined clusters of eigenvalues
for a suitable perturbation P=f(h)Q where Q is a pseudo-differential
operator of order zero and f(h) is a small quantity depending
of
the Planck's parameter h. ハハWe will show that the distribution
of
eigenvalues in those clusters has a semi-classical limit ハinvolving
the averages of the principal symbol of Q along the classical
orbits
of the Kepler problem.
注意:いつもより30分遅く始まります.当日は上智大理工 田原秀敏氏の集中講義もあります.
2010 年 7 月 12 日 (月)~16 日 (金):14:40--16:40
日本大学での講演会
講演者: Luca Prelli (Universit{\`a} degli Studi di Padova)
タイトル: Sheaves on Subanalytic Sites (2 回講演)
第1回:2010 年 6 月 29 日 (火) 16:40--17:40 日本大学理工学部駿河台校舎 1 号館 5 階 151
教室
第2回:2010 年 7 月 1 日 (木) 16:40--17:40 日本大学理工学部駿河台校舎 ウェルトンビル 6 階
W63 教室
アブストラクト:
Classical sheaf theory is not well suited to study objects which
are
defined by growth conditions as tempered and Whitney functions.
For this reason we have to work in a bigger category where this
kind of
objects are well defined, the category of subanalytic sheaf.
The talk is divided in two parts. In the first one we will introduce
the
notion of subanalytic sheaves and give several examples in order
to show how
they permit to treat more functional objects than classical sheaves.
In the
second we will discuss some applications to D-modules.
2010年6月22日(火)
講師: Ivana Alexandrova 氏 (East Carolina University)
題目: Resonances for Magnetic Scattering by Two Solenoidal Fields
at Large Separation
Abstract: We consider the problem of quantum resonances in magnetic
scattering by two
solenoidal fields at large separation in two dimensions, and we
study how a trajectory
oscillating between the two fields gives rise to resonances near
the real axis when
the distance between two centers of fields goes to infinity. ハWe
give a sharp lower
bound on resonance widths in terms of backward amplitudes calculated
explicitly for
scattering by each solenoidal field. ハThe study is based on a
new type of complex
scaling method. ハAs an application, we also discuss the relation
to semiclassical
resonances in scattering by two solenoidal fields. This is joint
work with Hideo Tamura.
2010年6月15日(火)
講師: 滝口 孝志 氏 (防衛大学校 数学教育室)
題目: Sato's counterexample and the structure of generalized functions
Abstract: In this talk, we discuss the relation between the structure
and the microlocal unique continuation property of generalized
functions. We also mention some applications of the microlocal
unique continuation property.
2010年4月13日(火)
講師: Jean-Marc Bouclet 氏 (トゥールーズ大学)
題目: Strichartz estimates and the Isozaki-Kitada parametrix on
asymptotically hyperbolic manifold
2010年1月26日(火)(12日から講演日変更になりました.)
講師: Jacob S. Christiansen 氏 (コペンハーゲン大学)
題目: Finite gap Jacobi matrices (joint work with Barry Simon and
Maxim Zinchenko)
2010年1月19日(火)
講師: 岡田 靖則 氏 (千葉大・理)
題目: 超函数の有界性と Massera 型定理について
2009年12月18日〜19日:研究集会「微分方程式の総合的研究」が本研究科大講義室で開催されます。
2009年11月24日(火)
講師: 吉野 邦生 氏 (東京都市大学)
題目: Analytic Properties of Eigen Values of Daubechies Localization
Operator
Abstract: (1)ドーベシー局在化作用素の固有値の解析的性質、積分表示式、
(2)ドーベシー局在化作用素のシンボルの再現公式、
(3)ドーベシー局在化作用素のバーグマンーフォック空間での表示
等について述べる。
2009年9月15日(火)
講師: 打越 敬祐 氏(防衛大学校数学教育室)
題目: 渦層の超局所解析
(21 pictures; 1(700KB),
2(600KB))
要旨:渦層とは,2次元流体が界面を境に2層に分かれて流れる状態で,今井功氏は「佐藤超関数は渦層である」と言っている.この考え方を用いると,
界面の時間変化を記述するBirkoff-Rott方程式を,擬微分方程式に書き直して解けることを説明する.
2009年7月21日(火)
講師: Georgi Raikov 氏(PUC, Chile)
題目: Low Energy Asymptotics of the SSF for Pauli Operators with
Non-Constant Magnetic Fields
(23 pictures; 1(700KB),
2(800KB))
Abstract: In my talk, I will consider the 3D Pauli operator with
non-constant magnetic field of constant direction,
perturbed by a matrix-valued electric potential which decays fast
enough at infinity. I will discuss
the low-energy asymptotics of the associated spectral shift function
which is proportional to the eigenvalue
counting function at negative energies, and to the scattering
phase at positive energies.
2009年6月30日(火)
講師: Ivana Alexandrova 氏(東京大数理)
題目: The Structure of the Scattering Amplitude for Schrodinger
Operators with a Strong Magnetic Field
(21 pictures; 1(800KB),
2(800KB))
Abstract: We study the microlocal structure of the semi-classical
scattering amplitude for Schrodinger operators with a strong magnetic
field at non-trapping energies. We prove that, up to any order,
the scattering amplitude can be approximated by a semi-classical
pseudodifferential-operator-valued Fourier integral operator.
2009年6月2日(火)
講師: 神本 晋吾 氏(東京大数理)
題目: 無限階擬微分作用素の形式核関数について
(30 pictures; 1(800KB),
2(700KB))
2009年5月26日(火)
講師: Myriam Ounaies 氏 ( Strasbourg大学数学科)
題目: Intrepolation problems in Hエ"ormander algebras
(44pictures; 1(900KB),
2(900KB),
3(900KB))
Abstract:
We call H嗷mander algebras the spaces $A_p(\mathbb C)$ of entire
functions $f$ such that, for all $z$ in $\mathbb C$, \[|f(z)|\le
Ae^{Bp(z)},\] where $A$ and $B$ are some positive constants (depending
on $f$) and $p$ is a subharmonic weight. We consider the following
interpolation problem : Given a discrete sequence $\{a_j\}$ of
complex numbers and a sequence of complex values $\{b_j\}$, under
what conditions does there exist a function $f\in A_p(\mathbb
C)$ such that $f(a_j)=b_j$ for all $j$ ? In other words, what
is the trace of $A_p(\mathbb C)$ on $\{a_j\}$ ?
We say that $\{a_j\}$ is an interpolating sequence if the trace
is defined by the space of all $\{b_j\}$ satisfying $|b_j|\le
A'e^{B'p(a_j)}$, for some constants $A',B'>0$.
We use H嗷mander's $L^2$-estimates for the $\bar\partial$-equation
to describe the trace when the weight $p$ is radial and doubling
and to characterize the interpolating sequences for more general
weights.
2009年4月28日(火)
講師: 下村 明洋 氏 (首都大学東京)
題目: 非線型消散項を伴うシュレディンガー方程式の任意の大きさの初期データに対する解の漸近挙動(北直泰氏との共同研究)
(24 pictures; 1(800KB),2(700KB))
2009年1月20日(火)
講師: 吉野 邦生 氏 (武蔵工業大学)
題目: Generating function of eigenvalues of Daubechies Localization
Operator
(Daubechies Localization Operator の 固有値の母関数から symbol 関数を再現する公式について)
(25 pictures; 1(1500KB),2(1600KB))
2009年1月6日(火)
講師: 青木 貴史 氏 (近畿大理工)
題目: 野海・山田方程式系のWKB解に付随する幾何的構造
(本多尚文氏、梅田陽子氏との共同研究)
(25 pictures; 1(800KB),2(800KB))
2008年11月25日(火)
講師: Ovidiu Calin 氏 (Eastern Michigan University)
題目: Heat kernels for subelliptic operators
(67 pictures; 1(800KB),
2(800KB),
3(800KB),
4(800KB),
5(800KB))
Abstract:
Subelliptic operators are differential operators with missing
directions. Their behavior is very different than the behavior
or
elliptic operators. Among the most well known subelliptic operators
are the Grusin operator, the Heisenberg operator, and the Kolmogorov
operator. There are several methods of finding the heat kernels
of
subelliptic operators. The heat kernels of subelliptic operators
are
usually represented in integral form, but in the case of the
Kolmogorov operator we shall show that the heat kernel is of function
type. We shall spend some time on other subelliptic operators
too.
2008年11月11日(火)
講師: 新國 裕昭 氏 (首都大学東京)
題目:Rotation number approach to spectral analysis of the generalized
Kronig-Penney Hamiltonians
(13 pictures; 850KB)
函数解析特別セミナー(臨時開催)
2008年10月31日(金)
講師: Fran\c{c}ois Germinet 氏 (パリ大学セルジポントワーズ校)
題目:Poisson statistics for random Schr\"odinger operators
時間:17:00 - 18:00
部屋:数理科学研究科棟 123号室
(いつもと時間、場所が異なります。)
2008年10月28日(火)
講師: Serge Alinhac 氏 (パリ大学オルセイ校)
題目:Introduction to geometric analysis of hyperbolic equations
時間:17:00 - 18:00
部屋:数理科学研究科棟 123号室
(17 pictures; 2000KB)
(いつもと時間、場所が異なります。またこの日から3日間連続講演となります。第2回、第3回はそれぞれ29, 30日に同じ部屋、時間帯で行われます。なお、この週は月曜から金曜の14:40~16:40に、同じ123号室で非線形分散型方程式についての中西
賢次 氏の集中講議があります。)
2008年10月14日(火)(グローバルCOE講演会との共催です。)
講師: George Sell 氏 (ミネソタ大学)
題目: Thin 3D Navier-Stokes equations
-Ultimate boundedness of solutions with large data and global
attractors-
時間:16:00 - 17:30
部屋:数理科学研究科棟 002号室
(37 pictures; 1(800KB),
2(800KB),
3(800KB))
(いつもと時間、場所が異なります!)
講演要旨:
In both lectures we will examine a new topic of the thin
3D Navier-Stokes equations with Navier boundary conditions.
In the first lecture we will treat the ultimate boundedness
of strong solutions and the related theory of global
attractors.
In the second lecture, which will include a brief summary
of the first lecture, we will examine the role played by the
2D Limit Problem. These issues are a special challenge for
analysis because the 2D Limit Problem is NOT imbedded the
3D problem.
These lectures are based on joint work with Genevieve Raugel,
Dragos Iftimie, and Luan Hoang.
2008年5月20日(火)
講師: Vania Sordoni 氏 (ボローニャ大学)
題目: Wave operators for diatomic molecules
(37 photographs;1(600KB),2(600KB),3(600KB))
2008年5月13日(火)
講師: Andr\'e Martinez 氏 (ボローニャ大学)
題目: Resonances for non-analytic potentials (joint work with
T. Ramond and J. Sj\"ostrand)
(24 photographs; 1(600KB),
2(600KB))