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So far I could not understand the formal definition of limits. I know that limit of a function exists at a point say 'a' if left and right hand limit exist at that point. Then what is the need for the formal definition of limits?
Secondly, I am very confused by the usage of the notation of delta and epsilon and their usage in that definition.
Secondly, I am very confused by the usage of the notation of delta and epsilon and their usage in that definition.