sicp-ex-1.13


See the wonderfully explained solution by Ken Dyck (requires a browser that supports MathML):

http://www.kendyck.com/math/sicp/ex1-13.xml

Another proof:

http://www.billthelizard.com/2009/12/sicp-exercise-113-fibonacci-and-golden.html

Another one by Lucia:

https://www.evernote.com/shard/s100/sh/6a4b59d5-e99f-417c-9ef3-bcf03a4efecd/7e030d4602a0bef5df0d6dd4c2ad47bf


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