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1.
Spr. dla n=2
L=1-1/4=3/4
P=(2+1)/(2*2)=3/4
L=P
Zalozenie:
(1-1/4)(1-1/9)...(1-1/n²)=(n+1)/(2n)
Teza:
dla n+1
(1-1/4)(1-1/9)...(1-1/n²)(1-1/(n+1)²)=(n+2)/(2n+2)
Dowod:
L=(1-1/4)(1-1/9)...(1-1/n²)(1-1/(n+1)²)= z zalozenia
(n+1)/(2n)*(n²+2n+1-1)/(n+1)²=1/(2n)*(n²+2n)/(n+1)=
[n(n+2)]/[2n(n+1)]=(n+2)/[2(n+1)]=(n+2)/(2n+2)
L=P
co nalezalo udowodnic.
Chyba indukcyjnie najlepiej.