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Prove $\ln (x)$ is continuous using $\epsilon-\delta$ Remark: Actually, $1-\frac {1} {e^ {\epsilon}}$ is the smaller of the two, so in effect we are letting that be $\delta$ But we really don't need to bother finding that out: all we need to do is to show there is a $\delta$ that works
real analysis - Does the epsilon-delta definition of limits truly . . . This quote resonates with my current dilemma Does the Epsilon-Delta definition truly capture the essence of what we mean by a 'limit'? though the epsilon-delta definition is a mathematical construct, what evidence do we have that it accurately reflects our intuitive concept of a limit?
Clarification on bounding $\frac {1} {|x-3|}$ in $\epsilon$-$\delta . . . To guarantee that it is less than $\epsilon$, you need to have some condition on $|x-5|$ itself in terms of $\epsilon$ This is the thing you wrote in the final line The full argument written properly must start from $|x-5|<\min (1,2\epsilon)$ to somehow conclude $\left|\frac {1} {x-3}-\frac {1} {2}\right|=\frac {|x-5|} {2|x-3|}<\epsilon$