Dear All ---
How do I remove assignments, once having bound a variable at the
top-level ?
Look at this:
(%i16) z : 9 - sqrt(z)^2;
(%o16) 9 - z
(%i17) z : 9 - (z)^2;
2
(%o17) 9 - (9 - z)
(%i18) z : 9 - z^2;
2 2
(%o18) 9 - (9 - (9 - z) )
(%i19) z : (9 - z)^2;
2 4
(%o19) (9 - (9 - z) )
(%i20) z : 0$
(%i21) z;
(%o21) 0
(%i22) z : 9 - z^2;
(%o22) 9
(%i23) z := 9 - z^2;
I couldn't find in the documentation. Perhaps I need to sleep?
How do I "forget"?
TIA.
Henry