Video 1.2.1. NOT COVERED: The Epsilon-Delta Definition of a Limit.
If you are curious only, then feel free to check out video from a former UVic colleague Alfonso Gracia-Sac.
Section 1.2 Epsilon-Delta Definition of a Limit
We do NOT cover section 1.2 of APEX Calculus, but let me tell you just a little bit about it. The epsilon-delta definition of a limit is the standard rigorous mathematical definition of a limit. You will learn about it in Math 236 if you wish. In Math 100 we will accept the much more vague notion that a limit at a represents the value a function gets close to as x gets close to a - notice we haven’t made precise why "close" means, hence why a more rigorous definition is needed.
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