An exact Ramsey principle for block sequences

Details An exact Ramsey principle for block sequences An exact Ramsey principle for block sequences

2008-07-14

arxiv.org/abs/0807.2205v1

Mathematics

Functional Analysis

Scientific paper

We prove an exact, i.e., formulated without $\Delta$-expansions, Ramsey principle for infinite block sequences in vector spaces over countable fields, where the two sides of the dichotomic principle are represented by respectively winning strategies in Gowers' block sequence game and winning strategies in the infinite asymptotic game. This allows us to recover Gowers' dichotomy theorem for block sequences in normed vector spaces by a simple application of the basic determinacy theorem for infinite asymptotic games.

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