showgan@tg => YSITD: lim(n->infinity)h×pi/n×sigma(k=1->n)k²/n² hmmmm 感覺很難求 #5b1e33f3af66534e81fad7c7

showgan@tg says to YSITD

lim(n->infinity)h×pi/n×sigma(k=1->n)k²/n² hmmmm 感覺很難求

at Mon, Jun 11, 2018 4:33 PM