Stephen R. Wassell, Superexponentiation and Fixed Points of Exponential and Logarithmic Functions, Mathematics Magazine, Vol. 73, No. 2 (Apr., 2000), pp. 111-119 ...

The beloved HP-35, one of the first scientific calculators able to "perform transcendental functions such as trigonometric, logarithmic and exponential functions" with an LED display just received ...

As a matter of fact, the most interesting part of it is in the, last two chapters, which contain an excellent discussion of the logarithmic and exponential functions based upon the definition of ...