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Finally, we give a new definition of chaos, named DC2[Formula: see text], which is similar to DC2, and show that DC2[Formula: see text] is an invariant of topological conjugacy and an iteration invariant (that is, for any integer [Formula: see text], [Formula: see text] is DC2[Formula: see text] if and only if [Formula: see text] is DC2[Formula: see text]). <\/jats:p>","DOI":"10.1142\/s0218127422500079","type":"journal-article","created":{"date-parts":[[2022,1,24]],"date-time":"2022-01-24T11:35:28Z","timestamp":1643024128000},"source":"Crossref","is-referenced-by-count":4,"title":["A New Version of Distributional Chaos, Distributional Chaos in a Sequence, and Other Concepts of Chaos"],"prefix":"10.1142","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5704-9348","authenticated-orcid":false,"given":"Hongbo","family":"Zeng","sequence":"first","affiliation":[{"name":"Department of Mathematical Sciences, Tsinghua University, Beijing 100084, P. R. 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