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 Special Issue on Mathematics of Integrable Systems: Classical and Quantum in honor of Leon Takhtajan for his 70th birthday
The Guest Editors for this special issue are
 
 Alexander Its (Indiana University - Purdue University Indianapolis, USA)
 Nicolai Reshetikhin (University of California, Berkeley, USA)
 Fedor Smirnov (LPTHE,  CNRS, University Paris 6, France)
 
 
This issue is devoted  to  integrable systems and their ramifications in modern mathematics.
The volume also  serves to honor Leon Takhtajan on the occasion of his 70th birthday.
 
Leon  Takhtajan  is  a world renowned expert in the field – in fact, one of its creators.
He has made several groundbreaking contributions to all key developments of integrable systems, both classical and
quantum. Among Takhtajan's pioneering  results are the establishing of the complete integrability
of the classical Nonlinear Shrödinger and  sine-Gordon equations and  the seminal works, done  together with Ludwig Faddeev,
Evgeny Sklyanin and Nicolai Reshetikhin, on the algebraic Bethe Ansatz, quantum inverse scattering method,
and on quantization of Lie groups and algebras.
 
In addition to the theory of classical and quantum integrable systems and
the theory of quantum groups, Leon Takhtajan has made  major contributions in many other
areas  which include   the
quantum field theories  on algebraic curves,
the Poincaré problem of the  accessory parameters of Fuchsian  uniformization, the local  index theorems
for a family of Riemann surfaces, a new  Kähler metric on module spaces and
the spectral theory of automorphic Laplacian and its relation to number theory.
This Special Issue is intended to reflect this remarkable broadness of Leon Takhtajan's
interests and achievements. The articles of the volume cover a wide range of the topics
from  the  theory of integrable systems per se to the various questions  of spectral theory, algebraic geometry,
quantum field theory and the theory of quantum groups.
 
Guest Editors        
 
  
Papers in this Issue:
 
- 
Geometric Models and Variation of Weights on Moduli of Parabolic Higgs Bundles over the Riemann Sphere: a Case Study
 
- 
Claudio Meneses
 SIGMA 18 (2022), 062, 41 pages   [ abs  
pdf ]
 
 
- 
Pullback Coherent States, Squeezed States and Quantization
 
- 
Rukmini Dey and Kohinoor Ghosh
 SIGMA 18 (2022), 028, 14 pages   [ abs  
pdf ]
 
 
- 
Novikov-Veselov Symmetries of the Two-Dimensional $O(N)$ Sigma Model
 
- 
Igor Krichever and Nikita Nekrasov
 SIGMA 18 (2022), 006, 37 pages   [ abs  
pdf ]
 
 
- 
Tau Function and Moduli of Meromorphic Quadratic Differentials
 
- 
Dmitry Korotkin and Peter Zograf
 SIGMA 18 (2022), 001, 10 pages   [ abs  
pdf ]
 
 
- 
Form Factors of the Heisenberg Spin Chain in the Thermodynamic Limit: Dealing with Complex Bethe Roots
 
- 
Nikolai Kitanine and Giridhar Kulkarni
 SIGMA 17 (2021), 112, 25 pages   [ abs  
pdf ]
 
 
- 
Boundary One-Point Function of the Rational Six-Vertex Model with Partial Domain Wall Boundary Conditions: Explicit Formulas and Scaling Properties
 
- 
Mikhail D. Minin and Andrei G. Pronko
 SIGMA 17 (2021), 111, 29 pages   [ abs  
pdf ]
 
 
- 
How to Draw a Correlation Function
 
- 
Nikolay Bogoliubov and Cyril Malyshev
 SIGMA 17 (2021), 106, 35 pages   [ abs  
pdf ]
 
 
- 
A Sharp Lieb-Thirring Inequality for Functional Difference Operators
 
- 
Ari Laptev and Lukas Schimmer
 SIGMA 17 (2021), 105, 10 pages   [ abs  
pdf ]
 
 
- 
Liouville Action for Harmonic Diffeomorphisms
 
- 
Jinsung Park
 SIGMA 17 (2021), 097, 16 pages   [ abs  
pdf ]
 
 
- 
Negative Times of the Davey-Stewartson Integrable Hierarchy
 
- 
Andrei K. Pogrebkov
 SIGMA 17 (2021), 091, 12 pages   [ abs  
pdf ]
 
 
- 
Resolvent Trace Formula and Determinants of $n$ Laplacians on Orbifold Riemann Surfaces
 
- 
Lee-Peng Teo
 SIGMA 17 (2021), 083, 40 pages   [ abs  
pdf ]
 
 
- 
Second-Order Differential Operators in the Limit Circle Case
 
- 
Dmitri R. Yafaev
 SIGMA 17 (2021), 077, 13 pages   [ abs  
pdf ]
 
 
- 
Completeness of SoV Representation for $\mathrm{SL}(2,\mathbb R)$ Spin Chains
 
- 
Sergey É. Derkachov, Karol K. Kozlowski and Alexander N. Manashov
 SIGMA 17 (2021), 063, 26 pages   [ abs  
pdf ]
 
 
- 
Some Algebraic Aspects of the Inhomogeneous Six-Vertex Model
 
- 
Vladimir V. Bazhanov, Gleb A. Kotousov, Sergii M. Koval and Sergei L. Lukyanov
 SIGMA 17 (2021), 025, 29 pages   [ abs  
pdf ]
 
 
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