when I try study some Published examples,so I found from different sagenb.
when run a code,take too more time(a green line appears).
so I want stop it,so I sign out and sign in again,the green still line appears,running all the time from yesterday to today,still green line appears
here still green line: https://sage.math.uni-goettingen.de/home/cjsh/7/
I try it at http://sagenb.skku.edu/, it is OK.sign out and sign in again,the green still line disappears at once.
I found sage.math.uni-goettingen.de is run on cloud server ,but it could be more better.
