If anyone could help with proving that f: D->R has a limit a at x in D if and only if f has a limit from above and a limit from below at x and both coincide, that would be appreciated.

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The function is mapping the Domain onto the Range. f:D->R.
Proofing tho..... not my strong point

maybe throw in a couple of deltas and epsilons to be on the safe side :)

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