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student12s
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I've been trying to answer the following question:
Let f be an arbitrary function of $(-\infty,+\infty)$ and let L be the set of point where f is right-continuous but not left-continuous. Show that L is countable.
Any help?
Let f be an arbitrary function of $(-\infty,+\infty)$ and let L be the set of point where f is right-continuous but not left-continuous. Show that L is countable.
Any help?