цытата
For example, consider the task of discovering interesting ideas in some specified area. The fololwing heuristic is often useful:

If there is an interesting function of two arguments f(x,y), look at what happens if the two arguments are identical.

In the domain of mathematics, this heuristic leads to the discovery of squaring if f is the function times, and it leads to the discovery of an identity function if f is the function of set union. In less formal domains, this same heuristic leads to the discovery of introspection if f is the function contemplate or it leads to the notion of suicide if f is the function kill.

Elaine Rich, "Artificial Intelligence", McGraw-Hill 1983