8.2 Is the solution unique?

No. The more complex the exercise, the more ways to solve it correctly there are. In the section about explained exercises, I already gave several solutions to one of them.

Of course, you can start deducing things which are absolutely unneeded, and you will achieve a solution different from the others. But it's better to try to solve each exercise in the minimum number of steps.

Daniel Clemente Laboreo 2005-05-17