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It shows that, for any 0 \u2264 p &lt; q \u2264 1 or p = q = 0 or p = q = 1, a dynamical system which is null and [Formula: see text] chaotic can be realized. <\/jats:p>","DOI":"10.1142\/s0218127414501004","type":"journal-article","created":{"date-parts":[[2014,7,30]],"date-time":"2014-07-30T09:32:54Z","timestamp":1406712774000},"page":"1450100","source":"Crossref","is-referenced-by-count":0,"title":["Topological Sequence Entropy and Chaos"],"prefix":"10.1142","volume":"24","author":[{"given":"Xin","family":"Liu","sequence":"first","affiliation":[{"name":"School of Mathematics and Computational Science, Sun Yat-Sen University, Guangzhou 510275, P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Huoyun","family":"Wang","sequence":"additional","affiliation":[{"name":"School of Mathematics and Information Science, Guangzhou University, Guangzhou 510006, P. R. 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