## An Investigation of the Laws of Thought, on which are founded the Mathematical Theories of Logic and Probabilities.

London, and Cambridge: Walton and Maberly; Macmillan & Co., 1854. First edition, first issue (see below). In this main work of Boole’s he gave the first proper presentation of Boolean algebra – “Boole invented the first practical system of logic in algebraic form, which enabled more advances in logic to..... More

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