This is one of the best methods of approximation to the value of square root of 2 used by the Pythagorean brotherhood.
Uploaded by Cristian Violatti, published on 23 September 2013 under the following license: Copyright, fair use. This content is protected by copyright. We believe that this reproduction constitutes fair use because: it is published for non-commercial educational purposes; no public domain copies are available of this material; only a small section of the work is reproduced in inferior quality; and this reproduction will not reduce the market for or value of the original work in any way.
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