Closely parallel to the belief in unlucky days was the notion of climacteric years, those periodic dates in a man's life which were potential turning-points in his health and fortune.
Nikolai Joukowski (1847-1921) was a Russian mathematician who did research in aerodynamics (James and James, 1992). He used circle inversion in the complex number plane to study airfoil shapes.
Eventually they just broke our base and took out every single one of our raxes.
Get that mog out of here!
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