Word Count : 113

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Let us show that the set $[a, \infty)$ is closed. A set is closed if its complement is open. The complement of $[a, \infty)$ in $\mathbb{R}$ is $(-\infty, ____ ______ _______ ________ ___ _________ ____ _______ ___.
_______ ____ ______ __________ ___ ___ __________ ______ ________ ___ ______ __________.
______ _____ _____ ____ ____ _________ _________ _________ _______ _________.
__________ __________ ___ ____ ______ _____ _____.
________ _________ _________ ____ _____ ___ ________ __________ ________ ___ __________ ________.
________ ____ _____ _____ ____ ________ ______ ____.
_________ __________ _____ __________ ________ ____ ___.
___ _________ ________ ___ _____ ___ ______ ____ _________.
_________ _______ _______ _______ _______ ________ _______ ________ __________ _____ ______.
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