seminar: On weak automorphs of binary forms over an arbitrary field

speaker: Andrzej Schinzel (Institute of Mathematics,Polish Academy of Sciences)

abstract: On weak automorphs of binary forms over an arbitrary field. A weak automorph of a binary form defined over a field K is a linear transformation T defined over K such that f(T(x,y)) = rf(x,y),r in K. For K = Q weak automorphs had been studied by B.Segre in 1946.It is shown how an extension of Segre's theorem leads to an improvement of the recent bound for the number of strict automorphs of f over C due to I.Berchenko and P.Olver.

timetable:
Wed 27 Apr, 10:00 - 11:00, Sala Conferenze Centro De Giorgi
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