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Limit[ Sign[],x>Infinity ]
Posted:
Feb 16, 2001 4:27 AM


Hi,
I give you two examples using ver. 4.0 on a Mac and a unix system.
Limit[ Sign[x]*Sign[z],x>Infinity ]
yields Sign[z] which is good.
Limit[ Sign[x]+Sign[z],x>Infinity]
yields an expression too ugly to present to a wide audience, which is bad. Its not a bug since
Limit[ Sign[x]+Sign[z],x>Infinity]//FullSimplify
yields 1+Sign[z] which is good.
I propose the name "buglet" to describe such "features" :). By the way, I tried some obvious variations on combinations of Sign[z] and Sign[x] and found it pretty hard to predict the output.
Happy hunting
Jack



