Location: Chapter 21, solution to Problems 3 and 4
Note: additional solutions due to bird expressions equivalent to those given in the text.
Problem 3 (c)
Besides the solution L(LL)(L(LL)), the following is also valid:
Besides the solution L(BKM)(L(BKM)), the following is also valid:
According to the first method illustrated in the Chapter, any bird A is a good solution as long as it is built according to
where all that is needed from A_1, in turn, is that it satisfies a problem-specific condition. Hence, if more than one bird A_1 is found for a certain Problem, it automatically follows that there are more than one solution for the Problem.
For Problem 3 (c), two expressions for A_1 can be found:
and likewise for Problem 4: