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	The empty set		2008-09-29
		From wahab: Why a null set is called a set? the definition of set includes that a set is a collection of well defined objects But a null set is having no value. Answered by Harley Weston.
	The empty set is a subset of every set		2006-11-14
		From Narayana: The empty set is a subset of every set Answered by Stephen La Rocque and Penny Nom.
	Sets and elements		2002-08-22
		From Dianne: I want to know why its okay to say that, for example, 6 is an element of the set of integers, but you get counted off for saying that the set of 6 is an element of the set of integers. How come? Answered by Judi McDonald.
	Composition of functions		2002-04-06
		From Yvonne: In our new text book, the following question occurs: State the domain and range of g(f(x))given that f(x) = -x2 - 4 and g(x) = sqrt(x) The range of f(x), x<=-4, is the domain of g(x). BUT, there is no solution in the Real numbers for g(f(x))= sqrt(-x2 - 4). In the solutions it says that this is not a function and therefore does not have a domain or range. Is it a relation? Is it anything? Answered by Claude Tardif.

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