Proportions of the Golden Section
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import matplotlib.pyplot as pt
from math import sqrt
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a = 0
b = 1
m1 = a + (1-(sqrt(5)-1)/2) * (b-a)
m2 = a + (sqrt(5)-1)/2 * (b-a)
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pt.xlim([a-0.5, b+0.5])
pt.grid()
pt.plot([a,b], [0,0], "ob")
pt.plot([m1, m2], [0,0], "or")
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