Composition of transseries, monotonicity, and analyticity
Vincenzo Mantova (University of Leeds)
Abstract: Transseries generalise power series by including exponential and logarithmic terms, if not more, and can be interpreted as germs of a non-standard Hardy field by composition (for instance, on surreal numbers). I'll discuss a few results that must 'obviously' be true, yet their proofs are not obvious: that composition is monotonic in both arguments, once claimed but not proved by Edgar for LE-series, that it satisfies a suitable Taylor theorem and that in fact composition is 'analytic with large radius of convergence' (joint with V. Bagayoko), something which appeared before in various special forms, but not in full generality. I'll show how monotonicity and Taylor can be used to prove some fairly general normalisation results for hyperbolic transseries (joint with D. Peran, J.-P. Rolin, T. Servi).
Mathematics
Audience: researchers in the topic
Series comments: This is the Algebra, Number Theory, Logic and Representation theory seminar.
| Organizers: | Chris Birkbeck*, Lorna Gregory* |
| *contact for this listing |