Calculus haiku: continuity

The formal definition of the continuity of a function f at a value a is that (1) the value f(a) be defined, (2) the function f has a limit as x approaches a, and (3) that these two values are equal.   This can be expressed extremely concisely by the equation

or, with slightly less brevity but more zen-like peace, as

and for the graphically inclined, as

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