BUILT-IN MATHEMATICA SYMBOL
- Direction->1 takes variables to approach their limits by increasing from smaller values.
- Direction->-1 takes variables to approach their limits by decreasing from larger values.
- The default setting is Direction->Automatic, which determines the direction from assumptions that have been given, using Direction->-1 as the default. For limit points at infinity, the direction is determined from the direction of the infinity.
- Direction->z specifies that limits should be taken in the direction corresponding to the complex number z.
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