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Please answer this:3+3 =

Original Message (ID '133139') By Nasser M. Abbasi:
Integrate[ If[x >= y && xup == yup, 1, 0] 1/((1 - xup) (1 - yup)), {x, xup, 1}, {y, yup, 1}] ---------------------------------- I get a syntax error when I copy and paste your code. Try to post code that at least works, it will help others help you.