How to Evaluate ∫∞0⌊x⌋e−xdx , where ⌊x⌋ is the largest integer less than x?
I am thinking of using something like ∫∞0(e−2+2e−3+....+ne−n−1+.....)dx and then use ∫ne−n−1=−e−n But the integral, AFAIK, is only finitely-additive, so now what?
How to find lim without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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