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In the sidebar on the right there is a colon 'related' and also a colon 'linked' if there are posts that link to the current one. There I found If $f(x) \geq 0$, then $g(x) =f(x)+f'(x)+f''(x)+...+f^r(x) \geq 0$ which is very recent. Of course this only works if the post is linked on this site. Otherwise searching for the ID-number of the ...


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