Perhaps it's something in the previous section that we weren't assigned or not, but what does it mean by the deleted neighborhood of a? It seems like it includes everything except for a, which would kind of make sense because we're discussing limits and quite often limits aren't defined at the point. The toughest part for me about the chapter is choosing the values for epsilon or sigma. How exactly do we know what we want to specify sigma as? It varies from problem to problem and I haven't yet gotten the pattern of it.
The coolest thing about this class for me is actually understanding things that I've grown up learning. While I wouldn't say that this section actually helped me understand limits and calculus, it has definitely helped. Something that was neat was the need to specify a range of acceptable 'closeness'. In programming you often need to put stopping criteria in a loop which is analagous to limits and their 'stopping criteria' of epsilon.
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