Discussion #1: What ideas or thoughts do you have about #1,2,5,8, or 9? Be sure that you make a clear reference to the particular student argument.
Discussion #2: How do the student arguments for #3 & 4 shaped your thinking about valid mathematical justifications? Be sure that you make a clear reference to the particular student argument.
Discussion #3: How does the focus on form vs. substance impacted your view of the arguments for #6, 7, and 10? How do we deal with extraneous statements that may not be part of the broader argument? Be sure that you make a clear reference to the particular student argument.