Lecture 22 - Tue 2023 11 28  Continue with discrete maps. Liapunov exponents.
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Review from Lecture 20: Orbit Diagram and MORE ON Orbit Diagram.
Recall the Logistic Map y = r*x*(1-x);  0 <= r <= 4 and 0 <= x <= 1.
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                                                             Lyapunov Exponent.
See scan of hand-written lecture notes "Lecture20_2021_scan.pdf"
Discrete and continuum definition.
Implications for predictability of a positive Liapunov exponent:
   Doubling the time requires squaring the precision of the data.
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