"Bills of attainder, ex-post facto laws and laws impairing the obligation of contracts are contrary to the first principles of the social compact, and to every principle of sound legislation."

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There is a famous formula, perhaps the most compact and famous of all formulas - developed by Euler from a discovery of de Moivre: e^(i pi) + 1 = 0... It appeals equally to the mystic, the scientist, the philosopher, the mathematician.

— Edward Kasner