https://www.nicovideo.jp/watch/sm33198857 https://www.youtube.com/watch?v=nkJU3bP5D1g&t=11s

2. “The worst is not, So long as we can say, ‘This is the worst.’.”
— Shakespeare —

5. S K

6. S K

7. S K

8. S K

9. S K
S

10. S K

11. S K

12. S K
K

13. S K

14. S K

15. S K
K S
S

16.
✤
✤
S K

17. A B
((1/2,1/2), (1/2,1/2))

18. EA(p, q)=pq(-1)+p(1-q)+(1-p)q+(1-p)(1-q)(-1)
=-1+2p+2q-4pq=2(1-2p)q+2p-1
minEA(p, q)
q
A B
EA(p, q)
p<1/2 q=0, EA(p, 0)= 2p-1
p=1/2 q , EA(1/2, q)= 0
p>1/2 q=1, EA(p, 1)= -2p+1
max minEA(p, q)
p q

19. EA(p, q)=2(2q-1)p-2q+1
maxEA(p, q)
p
A B
EA(p, q)
q<1/2 p=0, EA(0, q)= 1-2q
q=1/2 p , EA(p, 1/2)= 0
q>1/2 p=1, EA(1, q)= 2q-1
min maxEA(p, q)
q p

20.
A B

22. See you next time

23. A B

24. A B

25. A B

26. A B

27. A B