This book is an introduction to the theory of quasiconformal and
quasiregular mappings in the euclidean n-dimensional space, (where n is
greater than 2). There are many ways to develop this theory as the
literature shows. The authors' approach is based on the use of metrics,
in particular conformally invariant metrics, which will have a key role
throughout the whole book. The intended readership consists of
mathematicians from beginning graduate students to researchers. The
prerequisite requirements are modest: only some familiarity with basic
ideas of real and complex analysis is expected.