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Novella
the set of every set is that set
null set or empty set, is a set with no elements.
The novella named "The Invisible Man" was written by HG Wells and published in 1897.The novel named "Invisible Man" was written by Ralph Ellison (note there is no "The" in the title) and published in 1952.
The set contained in another set is termed as a sub-set.