Philosophical Essay on Probabilities

work by Laplace

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July 16, 2026

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Pierre-Simon Laplace's A Philosophical Essay on Probability (1814) is a foundational work in probability theory. It presents probability as a measure of the likelihood of an event occurring, based on the available evidence. Laplace applied mathematical principles to understand uncertainty, famously stating that probability is "good sense reduced to calculation".12

The essay explores how to infer causes from observed effects and uses probability to analyze scientific data, including astronomical observations. Laplace also applied these concepts to fields like judicial decisions and electoral outcomes, aiming to formalize reasoning in areas where certainty is not possible. His work established probability as a crucial tool for scientific inquiry and decision-making.31

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probability and statistics
A new kind of regularity
Laplace argued in his Philosophical Essay on Probabilities (1825) that man’s dependence on probability was simply a consequence of imperfect knowledge. A being who could follow every particle in the universe, and who had unbounded powers of calculation, would be able to know the past and to predict the…
Read More
Laplace argued in his Philosophical Essay on Probabilities (1825) that man’s dependence on probability was simply a consequence of imperfect knowledge. A being who could follow every particle in the universe, and who had unbounded powers of calculation, would be able to know the past and to predict the…
Read More