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Comment: added reference to fenics/dolfin

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fix links

Deletions are marked like this.  Additions are marked like this. 
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* [[http://www.sagemath.org:9001/graph_surveygraph theory]] * [[http://www.sagemath.org:9001/plotplotting/graphics]] 
* [[http://wiki.sagemath.org/graph_surveygraph theory]] * [[http://wiki.sagemath.org/plotplotting/graphics]] 
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* [[http://www.sagemath.org:9001/combinatoricsCombinatorics]]  * [[http://wiki.sagemath.org/combinatoricsCombinatorics]] 
Software that may be useful for
 differential equations:
xmds  An opensource XML based simulation package, of ordinary differential equations (ODEs) and partial differential Equations (PDEs).
scipy's collection of dynamical systems programs.
fenics Fenics is free software for automated solution of differential equations. It is separated into components, and already has a python interface (dolfin).
 Databases/tables:
 Notebook Editing
It's All Text  a Firefox plugin which will launch the editor of your choice with the contents of a text box. Perfect for Wiki editing and working in the notebook
Python Quick Reference  The ultimate Python resource. Grab the single page version and save locally (its pretty big)