some links cannot back Sage Reference Manual
asked 2014-10-27 03:41:03 -0600
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when link below,no button to back to Sage Reference Manual
when link below,no button to back to Sage Reference Manual,it link to http://trac.sagemath.org/13100,but blank page...
there are more links like above troubles at other places in Sage Reference Manual,I meet several times