How do I write that `x` belongs to the domain of all real numbers `R` , such that `x` is greater than or equal to `a` and less than or equal to `b` ?

Expert Answers

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The closed interval `[a,b]` is the set of all real numbers `x` such that `alt= xlt= b` . This is written as,

`[a,b]={x in R| alt= xlt= b}`

This is usually written this simply as `{x | alt= xlt= b}` , and it is understood that `x` belongs to `R` .

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