∫00,a e^(-px) dx is convergent if p>0 and divergent if p<0
∫ e-pxdx a =[-(1/p)e-px] 0 to ∞ =(1/p)[1-e^(-px)] =(1/p)(1-0) if p>0 since Lim e^(-px) =0 if p>0 and x->+∞ or =undefined or divergent otherwise
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