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how to do interval and set notation. A closed interval is one that includes its endpoints. For example you can press ALT 0247 on Windows to type.
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This set is all numbers between 2 and positive infinity so you write it as. The open interval ab represents the set of all real numbers between a and b including a and b. The 5 on the left means the set of numbers starts on the number line with 5.
A round bracket when we dont.
The symbol in between the two sets is the union symbol and means that the solution can belong to either interval. Set-Builder Notation looks like this. This interval notation would be interpreted just like the interval above except. You describe the whole set as.
