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## Search Loci: Convergence:

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Even fairly good students, when they have obtained the solution of the problem and written down neatly the argument, shut their books and look for something else. Doing so, they miss an important and instructive phase of the work. ... A good teacher should understand and impress on his students the view that no problem whatever is completely exhausted.
One of the first and foremost duties of the teacher is not to give his students the impression that mathematical problems have little connection with each other, and no connection at all with anything else. We have a natural opportunity to investigate the connections of a problem when looking back at its solution.

How to Solve It. Princeton: Princeton University Press. 1945.

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# Mathematical Treasures

## Zhoubi suanjing

These two pages are from the Zhoubi suanjing (Arithmetical Classic of the Gnomon and the Circular Paths of Heaven), a Chinese book on astronomy and mathematics dated to approximately 100 BCE.  These images are from a Ming dynasty copy printed in 1603.  These diagrams were added to the original text at some point in an attempt to illustrate a dissection proof of the "Pythagorean Theorem", known by the Chinese as the Gougu theorem.  A complete English translation and analysis of the Zhoubi suanjing is given by Christopher Cullen in his Astronomy and mathematics in Ancient China: the Zhou bi suan jing (Cambridge University Press, 1995).  See, in particular, appendix one.

On this page, the diagram on the right is usually called the "hypotenuse diagram" and illustrates the proof of the theorem in the 3-4-5 case.  The diagram on the left shows how a square of side 3 fits into a square of side 5.

This diagram illustrates a square of side 4 fitting into a square of side 5.