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problem writing a simple equation--urgent!!!
Hi all, I have a problem about writing an equation in mathematica. I am writing the following equation: u[x_, y_] = x + 2*y and when I write for example u[2,4] , it gives the result. But the problem that I have is expressing this equation with parameters. That is u[x, x] = x + 2*x but when I ask u[2,4]; it gives u[2,4] result.It doesn't calculate. So, how can I write this equation? Thanks all.