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For instance, the first interval is finite on the left side and infinite to the right side.
Because, the left end of the interval is a real number, since the right end is a symbol, and not a value.
The real set of number contains also the symbols infinite and -infinite, but they are not real values.
The second interval (1, 1.4] is also finite, since both ends are real values. This interval is opened to the left side and closed to the right. That means that the value 1 is not included but is included.
The 3rd interval is the real set of numbers, that is infinite.
(-∞ ,∞) = R
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