I'm taking my first course on analysis. I came across this theorem and I wonder whether this proof that I have written is correct. In case it is incorrect, please point out the mistakes I have made.
Here is the written proof:

I'm taking my first course on analysis. I came across this theorem and I wonder whether this proof that I have written is correct. In case it is incorrect, please point out the mistakes I have made.
Here is the written proof:

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