MAHLER’S AND KOKSMA’S CLASSIFICATIONS IN FIELDS OF POWER SERIES

Abstract

Abstract Let q a prime power and ${\mathbb F}_q$ the finite field of q elements. We study the analogues of Mahler’s and Koksma’s classifications of complex numbers for power series in ${\mathbb F}_q((T^{-1}))$ . Among other results, we establish that both classifications coincide, thereby answering a question of Ooto.