The Hertzsprung-Russell diagram was created - as the name suggests - by Ejnar Hertzsprung and Henry Norris Russell in 1910
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He created the "Venn diagram" which is used when dealing with "sets" in mathematics.
its a diagram
A diagram is a noun.
a Venn diagram consists of two overlapping circles, and is generally used as a compare and contrast diagram. a diagram in general is just a way to show information. in short, they are not the same thing, a venn diagram is a type of diagram.
Class diagram represent generalized view of system while object diagram represent view of a system at a particular instant.