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It is assumed that you have access to a SAGE notebook on your own server or you can use an account at (there are basic free accounts)
First how you would do it on a SAGE notebook (this does not work exactly the same on the cloud account, see further down):
  1. Create a new Notebook and open it.  
  2. Select Upload or Create File... form the Data... dropdown menu.  
  3. Fill in the URL for the file "poly.sage", as "".  You should get:
  4. After pressing "Upload or Create Data File" you will get a chance to edit the file's content.  You should not change anything unless you know what you are doing.
  5. Click on WORKSHEET to return to your notebook.
  6. type the command: load(DATA+'poly.sage') and execute the cell. You should see something like: 

Now for the cloud based option.

  1. Download poly.sage to you computer.  You may need to use the right mouse button and Save As.
  2. Create an account at or log in to your existing account.
  3. Create a new project, you should get something like the following after creating it:
  4. Click on +New 

  5. upload  poly.sage from your computer.
  6. Click on +new again and create a SageMath Worksheet.
  7. type load("poly.sage") and hit shift+enter to execute.
  8. Look at the tutorials to start :)