Another integral to convolute is $ f_z(z)= \int \limits_{z}^{\infty} \lambda e^{-\lambda \tau} \cdot \lambda e^{\lambda (z-\tau)} d\tau $

where i found the answer to be (e^-lambda*z)/2

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Ph.D. 2007, working on developing cool imaging technologies for digital cameras, camera phones, and video surveillance cameras.

Buyue Zhang