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...called "ArcTania"; ArcTania = Tania⁻¹. The ''ArcTania'' is an [[elementary function]]: ...the [[gain medium]] with simple kinetics. The inverse of Tania function is elementary function.

// generator of figure of approximation of [[tetration]] with elementary function. [[Image:TetrationApproLP100.jpg|300px|right]]

...<math>n!</math>: with more precise terminology, the factorial is not an [[elementary function]]. But it is possible to find a general formula for factorials with some mo

==Approximation of tetration with [[elementary function]]s== ...sums <ref name="k">k</ref> also should be considered as approximation with elementary function. However for the practical evaluation of tetration, shorter expressions are