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defines in graph theory defines in graph theory
No its not. A cycle is closed trail
There are lots of types of graphs. There's a bar graph, a pictograph, pie or circle graph, line graph and lots more. I can't think of anymore.+++:-) I can think of two more to help you, and the above have variations on them! The two more are the Column Chart (like a bar chart but with vertical stripes), and the Polar Graph, which is circular, of amplitude v. angle - but is not the same as the Pie Chart.'The "pictograph"... do you mean "pictogram"? if so that's a symbol, not a graph.
a graph that contains at least one null vertex is called forestanswer from :abdul rasheed rind: "the collection of trees is called forest"SS:A forest is an undirected graph, all of whose connected components are trees; in other words, the graph consists of a disjoint union of trees.
One graph used to relate stars' absolute magnitudes and their spectral types is the Hertzsprung-Russell diagram, better (and more simply) known as the H-R diagram.