PARIKH MATRICES, AMIABILITY AND ISTRAIL MORPHISM
Using the fact that the Parikh matrix mapping is not an injective mapping, the paper investigates some properties of the set of words having the same Parikh matrix; these words are called "amiable" or "M - equivalent". The presented paper uses the results obtained in [3] for the binary case. The aim is to distinguish the amiable words by using a morphism that provides additional information about them. The morphism proposed here is the Istrail morphism.
parikh matrix mapping amiable words scattered subwords, subword occurrences, istrail morphism