Abstract
The paper first defines mathematical and corpus linguistics, presents some significant Czech and world corpora and their authors and then focuses on the possibilities and meaning of language studies in corpus environment. It deals mainly with differences between written and spoken language documented by the frequency of parts of speech in written and spoken corpus.
It pursues as well a lexicon and morfological categories from contemporary written and spoken Czech (based on corpora SYN2005 and PSC). In the conclusion it emphasizes the contribution of different language aspects studies in corpora.