Delta epsilon proof of a limit

For those of you who read Highlights Magazine as a child:

Goofus: edits his original post to remove the content, thereby devaluing the topic and making others wonder whether he is afraid his professor will find that he has posted a problem that is part of a graded assignment.

Galant: returns to post his findings for the benefit of other students who may wish to see a worked example, and giving others a chance to add insights.
 
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