Lecture 23 - Thu 2023 11 30  Fractals, transversal structure of Rossler.
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                                                                       FRACTALS.
Cantor's work on infinity and cardinality.
--- Define cardinality and countable sets (can be ordered).
--- Show rationals have same cardinal as natural numbers.
Follow "Lecture20_2021_scan.pdf" pp 5-6
and    "Lecture21_2021_scan.pdf"
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