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lookup(M,A) -- provides the binary method named M for class A. The first place to look is A#M. The search proceeds with the parent of A, and so on.

lookup(M,A,B) -- provides the binary method named M for (A,B). The first place to look is Y#(M,A,B) where Y is the younger of A and B. The search proceeds next with the parent of B, and so on.

lookup(M,A,B,C) -- provides the ternary method named M for (A,B,C). The first place to look is Y#(M,A,B,C) where Y is the youngest of A, B, and C. The search proceeds with the parent of C, and so on.lookup x -- where x is a symbol or function, returns x.

If no method is found, then null is returned.

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