Poincar(e)CBirkhoff theorem states that every area and orientation preserving homeomorphism of an annulus that rotates the two boundaries in opposite direct
We intoroduce a new multidimensional p-adic continued fraction.Every quadratic element in Qp has a periodic continued fraction expansion by this algorithm.
Y.Ichikawa and S.Ito(2009)have constructed an odometer(or adic)representation of a non-degenerate 3-interval exchange transformation,via the Nakazawa-Ito-Ra