Homage to Yuri Reshetnyak on his ninetieth birthday

Fields of Logic and Computation, Essays Dedicated to Yuri Gurevich on the Occasion of His 70th Birthday

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Alfred Klemm on his 100th Birthday

After completing my studies in physics at the university in Frankfurt (Diplom), I started my PhD work in the group of Professor Alfred Klemm at the MaxPlanck-Institut für Chemie in Mainz on November 1, 1958. In my thesis, I measured the difference in thermal conductivity between oand p-H2 at 20 K. Alfred Klemm’s main area of research was molten salts; this subject, however, resulted from his co...

Evgeniĭ Mikhaĭlovich Lifshitz (On His Sixtieth Birthday)

Dedicated to Professor Daisuke Fujiwara on His Seventieth Birthday

Higher order simple-pole type operators, that is, higher order linear ordinary differential operators with a large parameter η whose coefficients have simple poles at the origin, are discussed from the viewpoint of the exact WKB analysis. Making use of the technique of microdifferential operators, we clarify the singularity structure of the Borel transform of their WKB solutions.

Dedicated to Armin Herzer on His 60th Birthday

In a desarguesian projective plane we discuss those degenerate conics whose parameters have degree two over the centre of the underlying skew field. Such degenerate conics are closely related with Baer subplanes. This relationship enables us to improve and reformulate in a geometric language some theorems which previously have been established in a purely algebraic way. A geometric description ...