On the Injectivity of Parikh Matrix Mappings
Arto K. Salomaa · Fundamenta Informaticae · 2004
We investigate the number of (scattered) subword occurrences and Parikh matrices, especially the case where the matrix determines the word uniquely. A condition introduced in this paper, called γ-property, turns out to be a powerful tool for such unambiguous matrices. Interconnections with the general theory of subword histories are also pointed out.