https://www.nicovideo.jp/watch/sm33339789 https://www.youtube.com/watch?v=1bni2cbKiqU&t=1213s

2. “Memory is the treasury and guardian of all things.”
— Marcus Tullius Cicero —

5. A B

6. A B

7. A B

8. A B

11. =>

12. A B
r
p1=r1r2r3
p2=r1r2(1-r3)
…
p8=(1-r1)(1-r2)(1-r3)
B sB
r1s1r2
p1s1+p2s1
=(p1+p2)s1
={r1r2r3+r1r2(1-r3)}s1=r1r2s1

13. A B
p
r1=p1+p2+p3+p4
r2=(p1+p2) /(p1+p2+p3+p4)
r3=(p5+p7) /(p5+p6+p7+p8)
B sB
p1s1+p2s1
r1s1r2
=(p1+p2+p3+p4)s1(p1+p2) /(p1+p2+p3+p4)
=s1(p1+p2)

14. A B

15. A B
“ ” p
(p1=1/3, p2=1/3, p3=1/3, p4=0)
r1×r2=p1=1/3
r1×(1-r2)=p2=1/3
(1-r1)×r2=p3=1/3
(1-r1)×(1-r2)=p4=0 <<r1=1 r2 =1
r1, r2
p

17. (a1-a3-a5-a7-a9, b2-b3)

20. See you next time