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This text explores the rivers of Greece which were gods and gods who were rivers, as individual deities in myth and art. Accounts of them are given by historians, mythographers and travellers, as well as by writers from Homer to Ovid.

Difference equations are playing an increasingly important role in the natural sciences. Indeed many phenomena are inherently discrete and are naturally described by difference equations. Phenomena described by differential equations are therefore approximations of more basic discrete ones. Moreover, in their study it is very often necessary to resort to numerical methods. This always involves a discretization of the differential equations involved, thus replacing them by difference equations. This book shows how Lie group and integrability techniques, originally developed for differential...