In the space of "X=E^1" let us find the complement of the following:
"(1,2],\\ [2,+\u221e),\\ \\{1,2,3,4,5\\}."
The complement of "(1,2]" is "(-\\infty,1]\\cup(2,+\\infty)." The complement of of "[2,+\u221e)" is "(-\\infty,2)." And the complement of "\\{1,2,3,4,5\\}" is "(-\\infty,1)\\cup(1,2)\\cup(2,3)\\cup(3,4)\\cup(4,5)\\cup(5,+\\infty)."
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