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A point or set of numbers that is a solution to two equations.
A singular point is any boundary point of the Disk that is not a regular point of the function.
The point of using letters in algebra is that they can stand for any number (or a range of numbers that are, as yet, unspecified). There is no specific letter allocated to a number.
in a coordinate point, the domain is the "x" part in (x,y) say you have a point that is (5,7). the domain would be 5.