It's not exactly an answer to your question, but if you aren't familiar with the Church-Turing thesis (http://en.wikipedia.org/wiki/Church%E2%80%93Turing_thesis

It's not exactly an answer to your question, but if you aren't familiar with the Church-Turing thesis (http://en.wikipedia.org/wiki/Church%E2%80%93Turing_thesis http://en.wikipedia.org/wiki/Church%E2%80%93Turing_thesis), you might find it interesting.