Lagrange's Four-Square Theorem Seen Using Polygons and Lines
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Any natural number can be represented as the sum of the squares of four non-negative integers. For most numbers there are multiple representations. In this Demonstration, the four integers (not squared) may be viewed using three different options.
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Contributed by: Noel Patson (July 2013)
Open content licensed under CC BY-NC-SA
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"Lagrange's Four-Square Theorem Seen Using Polygons and Lines"
http://demonstrations.wolfram.com/LagrangesFourSquareTheoremSeenUsingPolygonsAndLines/
Wolfram Demonstrations Project
Published: July 11 2013