define a subset
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The domain is whatever you want it to be. In the absence of a domain being defined explicitly, it is taken to be the whole of the real line.
define or describe each set of real numbers?
A set "A" is said to be a subset of "B" if all elements of set "A" are also elements of set "B".Set "A" is said to be a proper subset of set "B" if: * A is a subset of B, and * A is not identical to B In other words, set "B" would have at least one element that is not an element of set "A". Examples: {1, 2} is a subset of {1, 2}. It is not a proper subset. {1, 3} is a subset of {1, 2, 3}. It is also a proper subset.
The universal subset is the empty set. It is a subset of all sets.
A number does not have a subset.