I am having trouble with these problems.(adsbygoogle = window.adsbygoogle || []).push({});

Describe the graph of each function by computing some level sets and sections.

f:R^{3}-->R,(x,y,z)|-->xy

the part that i am having trouble with is R^{3}-->R what does that mean. As for computing the level sets all i do is set xy=to some constant. And then sketch it on the 3d plane.

Thanks.

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# Level sets and sections.

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