Gottfried Ploucquet

logician

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July 1, 2026

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Gottfried Ploucquet (1716–1790) was an 18th-century German logician who developed a symbolic calculus based on the ideas of Gottfried Wilhelm Leibniz. While his work did not significantly influence later logicians like George Boole or Gottlob Frege, Ploucquet made contributions to formal logic.12

Ploucquet's symbolic logic used the sign ">" to indicate that two concepts are disjoint, meaning they have no common basic concepts. In propositional logic, this is equivalent to the "neither...nor" function. He also used an equality sign for conceptual identity and represented concept intersection with "+" and union with multiplication. Ploucquet explored graphic representations of logical relations and was an early figure to consider representing quantification, though his methods were limited. He published his ideas widely and influenced contemporaries like Johann Heinrich Lambert.12

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history of logic
Gottfried Ploucquet
The work of Gottfried Ploucquet (1716–90) was based on the ideas of Leibniz, although the symbolic calculus Ploucquet developed does not resemble that of Leibniz (see illustration). The basis of Ploucquet’s symbolic logic was the sign “>,” which he unfortunately used to indicate…
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The work of Gottfried Ploucquet (1716–90) was based on the ideas of Leibniz, although the symbolic calculus Ploucquet developed does not resemble that of Leibniz (see illustration). The basis of Ploucquet’s symbolic logic was the sign “>,” which he unfortunately used to indicate…
Read More