Rigidity Testing of Frameworks
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Braces can make a square grid rigid. If every row and column has a brace, the braces can be considered as nodes of a graph. These nodes are connected if they share a row or column. If the resulting graph is connected, the structure is rigid. Click the squares to add or remove braces.
Contributed by: Ed Pegg Jr (August 2008)
Open content licensed under CC BY-NC-SA
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"Rigidity Testing of Frameworks"
http://demonstrations.wolfram.com/RigidityTestingOfFrameworks/
Wolfram Demonstrations Project
Published: August 27 2008