[Member (365WT)]answers [Chinese ]  Time :20190616  The Euler diagram refers to all the edges in the pass graph (undirected graph or directed graph) and passes through only one pass on each side. The corresponding loop is called the Euler loop. A diagram with an Euler loop is called an Euler diagram, and a diagram with an Euler path and no Euler loop is called a semiEulerian diagram. A modern extension to the Euler diagram is the spider map, which adds a point of attachment to the Euler diagram that can be connected. This gives the Euler extraction feature. The Euler diagram already has a conjunction feature (that is, the zone defines the existence of objects with the nature of the ups and downs in the zone). So spider maps allow the use of Euler graph modeling logic or conditions.
inventor
Euler
substance
Graph with Euler loop
SemiEurope Diagram with Euler pathway without Euler loop
origin
18th century
Modern expansion
Spider map 
