The Ternary Calculating Machine of Thomas Fowler

[dhamidi]

See also Setun <http://en.wikipedia.org/wiki/Setun>, a computer from 1958 using the balanced ternary system.

[dsplatonov]

Nice. It's strange why don't we have such computers nowadays

[todd8]

Knuth's Art of Computer Programming, vol 2 [1], not surprisingly, gives a thorough discussion of the balanced ternary system.

The solution for a nice brainteaser can be found quickly once one thinks about balanced trinary, here it is: "Using a balance scale, what is the minimum number of wheights needed to weigh any whole number of grams up to 40g?"

[1] http://www.amazon.com/Art-Computer-Programming-Volume-Seminu...

[ssdfsdf]

I often wonder if there is some notion of a basis of computation in mathematics. You can do stuff in binary, trinary, what about further out systems? What about working with functions/mappings which take more than two inputs. What can be said about the expressive power of these different ways of computing? Any one know where I should be looking for this kind of stuff?

[arethuza]

Describing computation in mathematical terms is arguably the core of Computer Science as a subject - particularly the "Theory of Computation":

http://en.wikipedia.org/wiki/Theory_of_computation

If you are interested in "functions/mappings" then you can look at Lambda Calculus and work your way right up to modern functional programming languages:

http://en.wikipedia.org/wiki/Lambda_calculus