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Question: i found some answers to this in zookal but can...

Question details

Show that the boundary of any set D is itself a closed set.

I found some answers to this in Zookal but can not understand them as i am so new to this mathematical world.

Can someone draw pictures and indicate all symbols for me to understand this question as you are solving this question?

Thank you so much. Please Draw pictures step by step Thank you!

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