A worksheet is an ordered list of Sage calculations with output.
A session is a worksheet and a set of variables in some state.
The Sage notebook is a collection of worksheets, saved objects, and user information.
The Sage Notebook was primarily written by William Stein with substantial contributions from Tom Boothby, Timothy Clemans, Alex Clemesha, Mike Hansen, Bobby Moretti, Yi Qiang, and Dorian Raymer.
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