Gottfried Wilhelm Leibniz was an intellectual giant who helped usher in the Age of Reason. He was preceded by other giants, Copernicus and Kepler, who overthrew the outdated Aristotelian cosmology using reason and empirical data, and Descartes who questioned existence itself and discovered conscious awareness is at its foundation. Leibniz was a contemporary of Newton, each of whom co-authored calculus, which is an indispensable mathematical tool of modern science and engineering. Leibniz is classified as a rational idealist, reasoning that the material universe, whose mechanics Newton revealed, must also have a non-physical counterpart to complete it. In this sense, Leibniz anticipated the mysterious, non-physical wave function, |Ψ⟩, over three hundred years prior to its discovery, and had he known about modern quantum mechanics, I am sure would have developed the Theory of Everything during his lifetime. In this short essay, I propose a deep connection between his metaphysics and modern quantum mechanics.
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