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limit/multi - multidimensional limits
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Calling Sequence
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limit(f, point)
limit(f, point, dir)
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Parameters
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f
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algebraic expression
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point
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set of equations of the form 
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dir
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(optional) direction
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Description
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The limit(f, point) calling sequence attempts to compute the limiting value of f in a multidimensional space at point.
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An equation of the form  in the limiting point is ignored.
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If the limit depends on the direction approached, undefined is returned.
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The optional direction dir is applied to all coordinates in point, and consequently each coordinate is approached from the same direction; from the left or right, bidirectional (real), or complex.
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Examples
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