Sources, Saddle Points, and Sinks in Vector Fields
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These are examples of how streamlines look for a source, a sink, or a saddle point.
Contributed by: Gosia Konwerska (March 2011)
Open content licensed under CC BY-NC-SA
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"Sources, Saddle Points, and Sinks in Vector Fields"
http://demonstrations.wolfram.com/SourcesSaddlePointsAndSinksInVectorFields/
Wolfram Demonstrations Project
Published: March 7 2011