Abstract
In this paper, we focus on n-player strategic chance-constrained games where the payoff of each player follows either Cauchy or normal distributions. We prove the equivalence between a Nash equilibrium problem and a variational inequality problem. We reformulate the latter as a nonlinear complementarity problem (NCP) through the Karush–Kuhn–Tucker (KKT) conditions. Then, we prove the existence of the Nash equilibrium via Brouwer’s fixed-point theorem. To show the efficiency of our approach, we perform numerical experiments on a set of randomly generated instances.
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Appendix A
Appendix A
This appendix contains the randomly generated (\(3 \times 3 \times 3\)) games presented in “(\(3\times 3\times 3\)) Random Games with Cauchy Distribution” and “\((3\times 3\times 3)\) Random Games with Normal Distribution” sections. \(\mu _i\) and \(\sigma _i\) are the mean and variance of player i, respectively. As for each game, there are three players and each player has three actions to choose from, \(\mu _i\) and \(\sigma _i\) should be tensors of size (\(3 \times 3 \times 3\)), displayed as three (\(3 \times 3\)) matrices.
The following are three randomly generated games with Cauchy distribution in “(\(3\times 3\times 3\)) Random Games with Cauchy Distribution” section:
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1.
The first random game with Cauchy distribution:
$$\begin{aligned} \mu _1(:,:,1)&= \begin{pmatrix} 1&{}1&{}2 \\ 2&{}3&{}1 \\ 1&{}3&{}1 \end{pmatrix} ,\ \mu _1(:,:,2) = \begin{pmatrix} 2&{}1&{}3 \\ 3&{}1&{}2 \\ 1&{}2&{}2 \end{pmatrix} ,\\ \mu _1(:,:,3)&= \begin{pmatrix} 2&{}1&{}2 \\ 1&{}3&{}2 \\ 3&{}1&{}3 \end{pmatrix} \\ \sigma _1(:,:,1)&= \begin{pmatrix} 1&{}2&{}1 \\ 3&{}2&{}2 \\ 3&{}2&{}2 \end{pmatrix} ,\ \sigma _1(:,:,2) = \begin{pmatrix} 3&{}2&{}2 \\ 3&{}3&{}3 \\ 2&{}2&{}3 \end{pmatrix} ,\\ \sigma _1(:,:,3)&= \begin{pmatrix} 2&{}1&{}1 \\ 2&{}1&{}3 \\ 2&{}2&{}1 \end{pmatrix} \\ \mu _2(:,:,1)&= \begin{pmatrix} 1&{}2&{}2 \\ 1&{}1&{}1 \\ 1&{}3&{}3 \end{pmatrix} ,\ \mu _2(:,:,2) = \begin{pmatrix} 3&{}1&{}1 \\ 2&{}2&{}2 \\ 1&{}2&{}3 \end{pmatrix} ,\\ \mu _2(:,:,3)&= \begin{pmatrix} 1&{}1&{}1 \\ 1&{}2&{}1 \\ 1&{}2&{}3 \end{pmatrix} \\ \sigma _2(:,:,1)&= \begin{pmatrix} 1&{}2&{}2 \\ 3&{}2&{}3 \\ 3&{}1&{}2 \end{pmatrix} ,\ \sigma _2(:,:,2) = \begin{pmatrix} 2&{}2&{}2 \\ 1&{}3&{}3 \\ 2&{}2&{}1 \end{pmatrix} ,\\ \sigma _2(:,:,3)&= \begin{pmatrix} 3&{}1&{}3 \\ 3&{}1&{}1 \\ 3&{}2&{}3 \end{pmatrix} \\ \mu _3(:,:,1)&= \begin{pmatrix} 1&{}3&{}3 \\ 2&{}3&{}2 \\ 2&{}3&{}3 \end{pmatrix} ,\ \mu _3(:,:,2) = \begin{pmatrix} 1&{}2&{}2 \\ 1&{}2&{}2 \\ 3&{}3&{}3 \end{pmatrix} ,\\ \mu _3(:,:,3)&= \begin{pmatrix} 3&{}1&{}2 \\ 2&{}3&{}1 \\ 1&{}1&{}3 \end{pmatrix} \\ \sigma _3(:,:,1)&= \begin{pmatrix} 3&{}1&{}1 \\ 2&{}3&{}2 \\ 2&{}1&{}1 \end{pmatrix} ,\ \sigma _3(:,:,2) = \begin{pmatrix} 3&{}1&{}3 \\ 3&{}2&{}2 \\ 3&{}2&{}3 \end{pmatrix} ,\\ \sigma _3(:,:,3)&= \begin{pmatrix} 2&{}1&{}2 \\ 2&{}1&{}3 \\ 3&{}1&{}3 \end{pmatrix} \end{aligned}$$ -
2.
The second random game with Cauchy distribution:
$$\begin{aligned} \mu _1(:,:,1)&= \begin{pmatrix} 1&{}1&{}1 \\ 1&{}1&{}2 \\ 1&{}2&{}3 \end{pmatrix} ,\ \mu _1(:,:,2) = \begin{pmatrix} 2&{}1&{}3 \\ 2&{}2&{}1 \\ 2&{}3&{}1 \end{pmatrix} ,\\ \mu _1(:,:,3)&= \begin{pmatrix} 2&{}1&{}1 \\ 2&{}3&{}1 \\ 2&{}1&{}1 \end{pmatrix} \\ \sigma _1(:,:,1)&= \begin{pmatrix} 2&{}3&{}1 \\ 2&{}3&{}3 \\ 1&{}3&{}3 \end{pmatrix} ,\ \sigma _1(:,:,2) = \begin{pmatrix} 3&{}2&{}1 \\ 3&{}1&{}1 \\ 3&{}2&{}3 \end{pmatrix} ,\\ \sigma _1(:,:,3)&= \begin{pmatrix} 1&{}2&{}3 \\ 1&{}2&{}2 \\ 1&{}1&{}3 \end{pmatrix} \\ \mu _2(:,:,1)&= \begin{pmatrix} 2&{}1&{}3 \\ 2&{}2&{}1 \\ 1&{}1&{}3 \end{pmatrix} ,\ \mu _2(:,:,2) = \begin{pmatrix} 2&{}1&{}3 \\ 3&{}2&{}3 \\ 3&{}2&{}1 \end{pmatrix} ,\\ \mu _2(:,:,3)&= \begin{pmatrix} 1&{}2&{}1 \\ 2&{}2&{}3 \\ 1&{}1&{}3 \end{pmatrix} \\ \sigma _2(:,:,1)&= \begin{pmatrix} 2&{}3&{}1 \\ 3&{}3&{}2 \\ 1&{}2&{}1 \end{pmatrix} ,\ \sigma _2(:,:,2) = \begin{pmatrix} 1&{}1&{}2 \\ 1&{}1&{}1 \\ 3&{}1&{}3 \end{pmatrix} ,\\ \sigma _2(:,:,3)&= \begin{pmatrix} 1&{}2&{}1 \\ 1&{}1&{}1 \\ 1&{}3&{}1 \end{pmatrix} \\ \mu _3(:,:,1)&= \begin{pmatrix} 1&{}3&{}1 \\ 1&{}2&{}3 \\ 2&{}1&{}3 \end{pmatrix} ,\ \mu _3(:,:,2) = \begin{pmatrix} 2&{}2&{}1 \\ 1&{}1&{}1 \\ 3&{}3&{}3 \end{pmatrix} ,\\ \mu _3(:,:,3)&= \begin{pmatrix} 2&{}3&{}3 \\ 2&{}3&{}2 \\ 3&{}1&{}2 \end{pmatrix} \\ \sigma _3(:,:,1)&= \begin{pmatrix} 1&{}2&{}1 \\ 3&{}3&{}2 \\ 2&{}1&{}2 \end{pmatrix} ,\ \sigma _3(:,:,2) = \begin{pmatrix} 3&{}1&{}3 \\ 3&{}1&{}3 \\ 3&{}1&{}3 \end{pmatrix} ,\\ \sigma _3(:,:,3)&= \begin{pmatrix} 1&{}1&{}2 \\ 3&{}2&{}3 \\ 1&{}1&{}2 \end{pmatrix} \end{aligned}$$ -
3.
The third random game with Cauchy distribution:
$$\begin{aligned} \mu _1(:,:,1)&= \begin{pmatrix} 1&{}2&{}3 \\ 1&{}2&{}2 \\ 2&{}2&{}2 \end{pmatrix} ,\ \mu _1(:,:,2) = \begin{pmatrix} 2&{}1&{}2 \\ 3&{}2&{}3 \\ 3&{}2&{}1 \end{pmatrix} ,\\ \mu _1(:,:,3)&= \begin{pmatrix} 1&{}2&{}2 \\ 1&{}2&{}2 \\ 3&{}2&{}2 \end{pmatrix} \\ \sigma _1(:,:,1)&= \begin{pmatrix} 3&{}1&{}1 \\ 2&{}1&{}2 \\ 3&{}1&{}2 \end{pmatrix} ,\ \sigma _1(:,:,2) = \begin{pmatrix} 2&{}3&{}1 \\ 3&{}3&{}1 \\ 2&{}3&{}3 \end{pmatrix} ,\\ \sigma _1(:,:,3)&= \begin{pmatrix} 1&{}3&{}3 \\ 2&{}2&{}3 \\ 2&{}2&{}2 \end{pmatrix} \\ \mu _2(:,:,1)&= \begin{pmatrix} 2&{}1&{}1 \\ 1&{}1&{}2 \\ 2&{}3&{}3 \end{pmatrix} ,\ \mu _2(:,:,2) = \begin{pmatrix} 2&{}3&{}1 \\ 3&{}3&{}1 \\ 2&{}2&{}2 \end{pmatrix} ,\\ \mu _2(:,:,3)&= \begin{pmatrix} 1&{}2&{}3 \\ 1&{}3&{}2 \\ 3&{}2&{}3 \end{pmatrix} \\ \sigma _2(:,:,1)&= \begin{pmatrix} 3&{}3&{}3 \\ 2&{}3&{}2 \\ 1&{}1&{}3 \end{pmatrix} ,\ \sigma _2(:,:,2) = \begin{pmatrix} 3&{}3&{}2 \\ 1&{}2&{}1 \\ 3&{}3&{}1 \end{pmatrix} ,\\ \sigma _2(:,:,3)&= \begin{pmatrix} 2&{}3&{}1 \\ 3&{}1&{}1 \\ 3&{}2&{}1 \end{pmatrix} \\ \mu _3(:,:,1)&= \begin{pmatrix} 3&{}2&{}3 \\ 2&{}1&{}2 \\ 1&{}1&{}3 \end{pmatrix} ,\ \mu _3(:,:,2) = \begin{pmatrix} 3&{}3&{}3 \\ 2&{}3&{}2 \\ 3&{}1&{}3 \end{pmatrix} ,\\ \mu _3(:,:,3)&= \begin{pmatrix} 2&{}1&{}2 \\ 2&{}2&{}3 \\ 3&{}3&{}3 \end{pmatrix} \\ \sigma _3(:,:,1)&= \begin{pmatrix} 2&{}1&{}3 \\ 1&{}2&{}3 \\ 2&{}2&{}3 \end{pmatrix} ,\ \sigma _3(:,:,2) = \begin{pmatrix} 3&{}2&{}3 \\ 2&{}1&{}2 \\ 3&{}1&{}3 \end{pmatrix} ,\\ \sigma _3(:,:,3)&= \begin{pmatrix} 1&{}1&{}1 \\ 2&{}2&{}2 \\ 2&{}2&{}1 \end{pmatrix} \end{aligned}$$
The following are three randomly generated games with normal distribution in 4.2:
-
1.
The first random game with normal distribution:
$$\begin{aligned} \mu _1(:,:,1)= & {} \begin{pmatrix} 3&{}1&{}2 \\ 1&{}1&{}2 \\ 3&{}2&{}3 \end{pmatrix} ,\ \mu _1(:,:,2) = \begin{pmatrix} 1&{}3&{}1 \\ 3&{}2&{}2 \\ 3&{}2&{}3 \end{pmatrix} ,\\ \mu _1(:,:,3)= & {} \begin{pmatrix} 1&{}3&{}2 \\ 1&{}3&{}3 \\ 1&{}3&{}3 \end{pmatrix} \\ \sigma _1^2(:,:,1)= & {} \begin{pmatrix} 9&{}1&{}1 \\ 4&{}9&{}1 \\ 4&{}1&{}4 \end{pmatrix} ,\ \sigma _1^2(:,:,2) = \begin{pmatrix} 4&{}1&{}1 \\ 9&{}9&{}1 \\ 9&{}1&{}1 \end{pmatrix} ,\\ \sigma _1^2(:,:,3)= & {} \begin{pmatrix} 4&{}4&{}4 \\ 4&{}4&{}4 \\ 1&{}9&{}1 \end{pmatrix} \\ \mu _2(:,:,1)= & {} \begin{pmatrix} 2&{}1&{}3 \\ 2&{}1&{}2 \\ 1&{}1&{}3 \end{pmatrix} ,\ \mu _2(:,:,2) = \begin{pmatrix} 2&{}2&{}3 \\ 2&{}3&{}1 \\ 1&{}2&{}2 \end{pmatrix} ,\\ \mu _2(:,:,3)= & {} \begin{pmatrix} 2&{}3&{}1 \\ 3&{}1&{}1 \\ 3&{}2&{}2 \end{pmatrix} \\ \sigma _2^2(:,:,1)= & {} \begin{pmatrix} 4&{}4&{}1 \\ 1&{}9&{}4 \\ 1&{}4&{}9 \end{pmatrix} ,\ \sigma _2^2(:,:,2) = \begin{pmatrix} 9&{}4&{}4 \\ 1&{}4&{}9 \\ 4&{}1&{}1 \end{pmatrix} ,\\ \sigma _2^2(:,:,3)= & {} \begin{pmatrix} 4&{}4&{}4 \\ 4&{}4&{}1 \\ 9&{}1&{}9 \end{pmatrix} \\ \mu _3(:,:,1)= & {} \begin{pmatrix} 3&{}3&{}2 \\ 1&{}1&{}1 \\ 3&{}3&{}2 \end{pmatrix} ,\ \mu _3(:,:,2) = \begin{pmatrix} 3&{}3&{}2 \\ 1&{}3&{}2 \\ 2&{}2&{}3 \end{pmatrix} ,\\ \mu _3(:,:,3)= & {} \begin{pmatrix} 3&{}3&{}2 \\ 2&{}3&{}1 \\ 2&{}3&{}1 \end{pmatrix} \\ \sigma _3^2(:,:,1)= & {} \begin{pmatrix} 1&{}9&{}9 \\ 9&{}9&{}1 \\ 9&{}4&{}1 \end{pmatrix} ,\ \sigma _3^2(:,:,2) = \begin{pmatrix} 4&{}9&{}1 \\ 1&{}4&{}1 \\ 1&{}9&{}9 \end{pmatrix} ,\\ \sigma _3^2(:,:,3)= & {} \begin{pmatrix} 9&{}1&{}9 \\ 1&{}4&{}9 \\ 4&{}4&{}9 \end{pmatrix} \\ \mu _1(:,:,1)= & {} \begin{pmatrix} 1&{}2&{}3 \\ 1&{}3&{}3 \\ 3&{}2&{}3 \end{pmatrix} ,\ \mu _1(:,:,2) = \begin{pmatrix} 3&{}3&{}1 \\ 1&{}3&{}2 \\ 1&{}1&{}3 \end{pmatrix} ,\\ \mu _1(:,:,3)= & {} \begin{pmatrix} 2&{}2&{}2 \\ 1&{}2&{}1 \\ 3&{}2&{}1 \end{pmatrix} \\ \sigma _1^2(:,:,1)= & {} \begin{pmatrix} 4&{}9&{}4 \\ 1&{}1&{}4 \\ 9&{}9&{}9 \end{pmatrix} ,\ \sigma _1^2(:,:,2) = \begin{pmatrix} 9&{}1&{}9 \\ 4&{}9&{}9 \\ 1&{}9&{}9 \end{pmatrix} ,\\ \sigma _1^2(:,:,3)= & {} \begin{pmatrix} 4&{}4&{}9 \\ 4&{}1&{}4 \\ 1&{}4&{}4 \end{pmatrix} \\ \mu _2(:,:,1)= & {} \begin{pmatrix} 2&{}1&{}2 \\ 3&{}3&{}1 \\ 1&{}3&{}1 \end{pmatrix} ,\ \mu _2(:,:,2) = \begin{pmatrix} 1&{}1&{}1 \\ 2&{}2&{}3 \\ 3&{}1&{}1 \end{pmatrix} ,\\ \mu _2(:,:,3)= & {} \begin{pmatrix} 1&{}2&{}1 \\ 2&{}1&{}2 \\ 1&{}3&{}1 \end{pmatrix} \\ \sigma _2^2(:,:,1)= & {} \begin{pmatrix} 4&{}9&{}4 \\ 9&{}4&{}4 \\ 4&{}4&{}9 \end{pmatrix} ,\ \sigma _2^2(:,:,2) = \begin{pmatrix} 4&{}4&{}9 \\ 1&{}4&{}9 \\ 9&{}9&{}1 \end{pmatrix} ,\\ \sigma _2^2(:,:,3)= & {} \begin{pmatrix} 4&{}9&{}4 \\ 4&{}1&{}1 \\ 9&{}9&{}4 \end{pmatrix} \\ \mu _3(:,:,1)= & {} \begin{pmatrix} 1&{}2&{}1 \\ 3&{}3&{}1 \\ 3&{}3&{}2 \end{pmatrix} ,\ \mu _3(:,:,2) = \begin{pmatrix} 3&{}3&{}3 \\ 3&{}3&{}1 \\ 1&{}1&{}2 \end{pmatrix} ,\\ \mu _3(:,:,3)= & {} \begin{pmatrix} 2&{}1&{}3 \\ 2&{}1&{}3 \\ 1&{}2&{}1 \end{pmatrix} \\ \sigma _3^2(:,:,1)= & {} \begin{pmatrix} 1&{}9&{}4 \\ 4&{}1&{}1 \\ 1&{}1&{}1 \end{pmatrix} ,\ \sigma _3^2(:,:,2) = \begin{pmatrix} 9&{}9&{}9 \\ 9&{}4&{}9 \\ 9&{}1&{}4 \end{pmatrix} ,\\ \sigma _3^2(:,:,3)= & {} \begin{pmatrix} 1&{}4&{}1 \\ 1&{}9&{}9 \\ 9&{}4&{}1 \end{pmatrix} \end{aligned}$$ -
2.
The third random game with normal distribution:
$$\begin{aligned} \mu _1(:,:,1)= & {} \begin{pmatrix} 2&{}3&{}1 \\ 2&{}3&{}3 \\ 2&{}1&{}2 \end{pmatrix} ,\ \mu _1(:,:,2) = \begin{pmatrix} 2&{}2&{}2 \\ 2&{}3&{}1 \\ 2&{}2&{}2 \end{pmatrix} ,\\ \mu _1(:,:,3)= & {} \begin{pmatrix} 2&{}1&{}1 \\ 1&{}1&{}2 \\ 3&{}3&{}1 \end{pmatrix} \\ \sigma _1^2(:,:,1)= & {} \begin{pmatrix} 1&{}4&{}1 \\ 9&{}1&{}1 \\ 1&{}1&{}4 \end{pmatrix} ,\ \sigma _1^2(:,:,2) = \begin{pmatrix} 4&{}9&{}4 \\ 4&{}4&{}1 \\ 9&{}4&{}4 \end{pmatrix} , \\ \sigma _1^2(:,:,3)= & {} \begin{pmatrix} 9&{}9&{}9 \\ 9&{}1&{}4 \\ 1&{}1&{}1 \end{pmatrix} \\ \mu _2(:,:,1)= & {} \begin{pmatrix} 3&{}2&{}2 \\ 3&{}3&{}1 \\ 3&{}1&{}2 \end{pmatrix} ,\ \mu _2(:,:,2) = \begin{pmatrix} 1&{}1&{}1 \\ 3&{}1&{}1 \\ 1&{}1&{}1 \end{pmatrix} ,\\ \mu _2(:,:,3)= & {} \begin{pmatrix} 1&{}2&{}1 \\ 1&{}1&{}3 \\ 1&{}2&{}1 \end{pmatrix} \\ \sigma _1^2(:,:,1)= & {} \begin{pmatrix} 1&{}4&{}1 \\ 9&{}1&{}1 \\ 1&{}1&{}4 \end{pmatrix} ,\ \sigma _1^2(:,:,2) = \begin{pmatrix} 4&{}9&{}4 \\ 4&{}4&{}1 \\ 9&{}4&{}4 \end{pmatrix} ,\\ \sigma _1^2(:,:,3)= & {} \begin{pmatrix} 9&{}9&{}9 \\ 9&{}1&{}4 \\ 1&{}1&{}1 \end{pmatrix} \\ \mu _3(:,:,1)= & {} \begin{pmatrix} 3&{}3&{}2 \\ 1&{}3&{}3 \\ 1&{}1&{}2 \end{pmatrix} ,\ \mu _3(:,:,2) = \begin{pmatrix} 2&{}3&{}3 \\ 3&{}3&{}1 \\ 2&{}1&{}3 \end{pmatrix} ,\\ \mu _3(:,:,3)= & {} \begin{pmatrix} 2&{}3&{}3 \\ 2&{}2&{}3 \\ 3&{}3&{}2 \end{pmatrix} \\ \sigma _3^2(:,:,1)= & {} \begin{pmatrix} 1&{}1&{}9 \\ 4&{}4&{}9 \\ 9&{}1&{}1 \end{pmatrix} ,\ \sigma _3^2(:,:,2) = \begin{pmatrix} 9&{}9&{}1 \\ 1&{}4&{}1 \\ 1&{}9&{}1 \end{pmatrix} ,\\ \sigma _3^2(:,:,3)= & {} \begin{pmatrix} 4&{}4&{}9 \\ 9&{}4&{}4 \\ 4&{}1&{}1 \end{pmatrix} \end{aligned}$$
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Zhang, S., Hadji, M., Lisser, A. et al. Variational Inequality for n-Player Strategic Chance-Constrained Games. SN COMPUT. SCI. 4, 82 (2023). https://doi.org/10.1007/s42979-022-01488-0
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DOI: https://doi.org/10.1007/s42979-022-01488-0