כוכב קלין (Hebrew Wikipedia)
Analysis of information sources in references of the Wikipedia article "כוכב קלין" in Hebrew language version.
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nayuki.io
- Nayuki Minase (10 במאי 2011). "Countable sets and Kleene star". Project Nayuki. נבדק ב-11 בינואר 2012.
{{cite web}}: (עזרה) - Countable sets and Kleene star, Project Nayuki
springer.com
- Ebbinghaus, Heinz-Dieter; Flum, Jörg; Thomas, Wolfgang (1994). Mathematical Logic (2nd ed.). New York: Springer. p. 656. ISBN 0-387-94258-0.
The Kleene closure L* of L is defined to be .
