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Mathematics
OpenStudy (nicola):

f(x,y) = absolute value xy... Sketch?

OpenStudy (anonymous):

z=(x,y). You already know that this graph, because it is a property of 2 dimensional space, will produce a blanket or a sheet of sorts. http://www.wolframalpha.com/input/?i=f(x,y)%20%3D%20abs(xy)

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