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(1707-1783) is one of the most important authors in the history of this type of diagram, but he is only the namesake, not the inventor. Euler diagrams were first developed for logic, especially syllogistics, and only later transferred to set theory. In the United States, both Venn and Euler diagrams were incorporated as part of instruction in set theory as part of the new math movement of the 1960s. Since then, they have also been adopted

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