PowerPoint Presentationarielpro/15780s17/slides/780s17-18.pdf · 30/10/2012 · Olympic Badminton...
Transcript of PowerPoint Presentationarielpro/15780s17/slides/780s17-18.pdf · 30/10/2012 · Olympic Badminton...
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o 𝑁 = {1,… , 𝑛}
o 𝑆
o 𝑖 ∈ 𝑁 𝑢𝑖: 𝑆𝑛 → ℝ
j ∈ 𝑁 𝑠𝑗 ∈ 𝑆
𝑖 𝑢𝑖(𝑠1, … , 𝑠𝑛)
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Selling ice cream at the beach. One day your cousin Teddy shows up. His ice cream is identical!
You split the beach in half; you set up at 1/4. 50% of the customers buy from you. 50% buy from Teddy.
One day Teddy sets up at the 1/2 point! Now you serve only 37.5%!
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• 𝑢𝑖 𝑠𝑖 , 𝑠𝑗 =
𝑠𝑖+𝑠𝑗
2, 𝑠𝑖 < 𝑠𝑗
1 −𝑠𝑖+𝑠𝑗
2, 𝑠𝑖 > 𝑠𝑗
1
2, 𝑠𝑖 = 𝑠𝑗
• 𝑁 = 1,2
• 𝑆 = [0,1]
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𝑠 = 𝑠1… , 𝑠𝑛 ∈ 𝑆𝑛
∀𝑖 ∈ 𝑁, ∀𝑠𝑖′ ∈ 𝑆, 𝑢𝑖 𝑠 ≥ 𝑢𝑖(𝑠𝑖
′, 𝑠−𝑖)
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Day 3 of the ice cream wars… Teddy sets up south of you! You go south of Teddy.
Eventually…
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• 𝑖 ∈ 𝑁 𝑥𝑖
𝑥𝑖(𝑠𝑖) = Pr[𝑖 plays 𝑠𝑖]
• 𝑖 ∈ 𝑁
𝑢𝑖 𝑥1, … , 𝑥𝑛 =
(𝑠1,…,𝑠𝑛)∈𝑆𝑛
𝑢𝑖 𝑠1, … , 𝑠𝑛 ⋅ෑ
𝑗=1
𝑛
𝑥𝑗(𝑠𝑗)
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•1
2,1
2, 0
0,1
2,1
2𝑢1
•1
3,1
3,1
3
𝑢1
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1.1
2,1
2, 0 ,
1
2,1
2, 0
2.1
2,1
2, 0 ,
1
2, 0,
1
2
3.1
3,1
3,1
3,
1
3,1
3,1
3
4.1
3,2
3, 0 ,
2
3, 0,
1
3
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• {2, … , 100}
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• 𝑠 𝑡 𝑠 < 𝑡𝑠 + 2
𝑠 − 2
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