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print 'foobar'
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%matplotlib inline
import numpy as np
import matplotlib.pyplot as plt
N = 50
x = np.random.rand(N)
y = np.random.rand(N)
area = np.pi * (15 * np.random.rand(N))**2 # 0 to 15 point radiuses
plt.scatter(x, y, s=area, alpha=0.5)
plt.show()
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np.rank?
If $\{A_n\}$ is pairwise disjoint, then
$$ \mu(\cup_n A_n) = \sum_n \mu(A_n) $$
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