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Entrepreneurs On IG on Instagram: "For Stephen Schwarzman, co-founder of Blackstone, success in private equity came from judgment, negotiation, and the ability to read people, skills no formula can replace, and he never used calculus. Charlie Munger has expressed a similar view, clear thinking and simple arithmetic often take you further than complex math in most investing. But that’s only part of the picture. In other corners of finance, such as quantitative trading, derivatives, and risk model