@Gilbert, @Sachin, @Stefan : I am facing a bit of a problem that I have written about in this week's blog here<http://musingsofafriend.wordpress.com/2013/07/06/gsoc-week-3-sympy-development-finishing-the-basic-structure/>. Please see the second part of the blog where I mention about a cache to hold relationships between coordinate system and base scalars and base vectors. Please comment your views here.
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