The most difficult part of the material was using the definition of the limit to prove these theorems about functions, especially choosing delta, but it seems very similar to how we choose N to define limits of series and summations.
The most interesting material was how limits can simply be added and subtracted, as well as multiplied and divided. The other thing was how delta is used to describe a neighborhood. In calculus and also in physics and chemistry, we mainly use delta to mean partial such as a partial charge or a partial differential. It is interesting that we use it in two different ways.
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