arXiv subjects
Publications and source records attributed to Yousuke Ohyama.
We formulate a geometric Riemann-Hilbert correspondence that applies to the derivation by Jimbo and Sakai of equation $q$-PVI from ``isomonodromy'' conditions. This is a step within work in progress towards the application of $q$-isomonodromy and $q$-isoStokes to $q$-Painlevé.
We propose a unified approach to $q$-special functions, which are degenerations of basic hypergeometric functions ${}_2ϕ_1(a,b;c;q,x)$. We obtain a list of seven different class of $q$-special functions: ${}_2ϕ_1, {}_1ϕ_1$, two different types of the $q$-Bessel functions, the $q$-Hermite-Weber functions, two different types of the $q$-Airy functions. We show that there exist a relation between two types of the $q$-Airy functions.
We give a basic theory on monodromy evolving deformations. proposed by Chakravarty and Ablowitz in 1996. We show that Halphen's second quadratic system can be described by monodromy evolving deformations. Our result is a generalization of the work on the DH-V system by Chakravarty and Ablowitz.
We will revise Garnier-Okamoto's coalescent diagram of isomonodromic deformations and give a complete coalescent diagram. In our viewpoint, we have ten types of isomonodromic deformations and two of them give the same type of the Painlevé equation. We can naturally put the thirty-fourth Painleve equation in our diagram, which corresponds to the Flaschka-Newell form of the second Painlevé equation.
We will classify all rational transformations which change the confluent hypergeometric equations to linear equations of the Painleve type from the first to the fifth. We show such rational transformations correspond to almost all of algebraic solutions of the Painleve equations from the first to fifth up to the Backlund transformations.