"(Leonhard) (Euler)" returned 2 hits

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Author: Leonhard Euler (1707-1783)
Introduction of a notation which gives a name and address to every possible point in 3D space, $(x,y,z)$.
Mediaitems: Euler biography:, De'couverte d'un nouveau principe de mecanique
Category: Statistics & Graphics
Author: John Venn (1834-1923)
Representation of logical propositions and relations diagrammatically. [Actually, Liebnitz and, to some degree, Euler had used such diagrams previously.]
Mediaitems: Venn diagram, Venn biography, Venn portrait, A survey of Venn diagrams, Wikipedia page on Venn and similar diagrams, Create your own Venn diagram
Category: Statistics & Graphics