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Hello,

First of all, you seem to use a local server at sage.epsevg.upc.edu. It runs version 6.1.1 of Sage which is already a bit old. Have a look at the current documentation on sagemath.org.

With 1, what do you mean ? The link is a wikipedia page. Why do you expect a button to go back to the reference manual ? Anyway, there is usually one on your browser.

With 2, the address http://trac.sagemath.org/13100 is perfectly valid and works well for me.

Vincent