New
I noticed today that, when you define a function with different parts (e.g. f(x)=6-x if x<1 and else f(x)=7-2x), the UpperSum (and LowerSum) command does not work. It uses only the first expression (6-x), even when x becomes greater than 1.
[See discussion and example in French Forum:]
http://www.geogebra.org/for...
[ZBM]
The same problem 
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