|  1 |    initial version    |  
The Sage you have installed is running on your computer,
and require no internet connection. When you use it using
the Jupyter notebook, it launches a Jupyter server on your
machine and connects your web browser to it. You will see
that the url in the url bar is http://localhost:8888/tree
where "localhost" indicates a connection to your computer,
and not the internet.
You can run the Sage read-eval-print loop (or command-line
interface) in the terminal (run sage in the terminal or
change directory to where Sage is installed and run ./sage)
or using the legacy SageNB notebook (run sage -n sagenb
or ./sage -n sagenb), or using the Jupyter notebook (run
sage -n jupyter or ./sage -n jupyter). All of them run
locally on your computer.
 
                
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