Is the function a joint probability density function? That is, is equal to 1 and is nonnegative?

This problem is really giving me a headache, been attempting it for a week now and the deadline's today. (Headbang)

- April 10th 2009, 11:19 AMcrazymonkeyIs the function 1/|x+y| a joint probability density function?
Is the function a joint probability density function? That is, is equal to 1 and is nonnegative?

This problem is really giving me a headache, been attempting it for a week now and the deadline's today. (Headbang) - April 10th 2009, 11:59 AMNonCommAlg