View Interval Notation All Real Numbers Pictures. .of all real numbers, although you should be aware that this notation is not complete free of potential confusion: Far too little set theory is included in the curriculum, and the addition of notation to denote sets constitutes a small step to improve this.

Interval Notation
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Unless specified otherwise, we will be working with real numbers. To infinity (but not beyond!) we often use infinity in interval notation. One uses braces { } and the other does not.

Indicating the solution to an inequality such as x≥4x≥4.

Positive or negative, large or small, whole numbers or decimal numbers are all real numbers. Second, if there is a denominator in the. A set including all real numbers except a single number. The infinity symbols and are used to indicate that the set is unbounded in the positive ( ) or negative ( ) direction of.