Piotrowski Law; sequences; activity; attributiveness; parameters; testing

The present study investigates the possibility of applying Piotrowski Law, a general mathematical principle of historical change in language, on two types of binary sequences - the activity strings, which consist of adjectives and verbs, and adnominal strings, comprising attributes and genitives. The fit is tested on various samples (sonnets, long poems, newspaper texts) written in Czech, Russian, English, and French. In the interpretation part, some ways of further research are sketched, including general employments in the theory of linguistic laws and parameter analyses. As to the latter, the study emphasises their use in testing the hypotheses on texts and in their classifications.