Comment #2 on issue 2637 by asmeurer: Unicode Sigma for pretty printed Sum http://code.google.com/p/sympy/issues/detail?id=2637
By the way, I recommend that you copy and paste these into your terminal to get an idea of what they look like there. The easiest way to do that is to open a Python session and type a = u"""<newline>, then paste the text, then type """<newline>. Then you can look at it by typing "print a" (or by looking at what you just pasted, but this also gives it to you in a nice Python unicode string).
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