A Solution to the Non-Cooperative Equilibrium Problem for Two and Three Players Using the Fixed-Point Technique
Abstract
:1. Introduction and Preliminaries
- (i)
- The topological spaces and are regarded as the strategies for the first player and second player, respectively;
- (ii)
- A topological subspace of the product space represents valid strategy pairs;
- (iii)
- We define a bi-loss operator as follows: , where represents the loss acquired by player j when strategies and are employed. A pair is stated as a NCE ifHence,Assume that the following maps exist:The mappings and satisfying the above properties are called optimal decision rules. Any solution to the system
- (i)
- (ii)
- (iii)
- (iv)
- where , and
- (i)
- Let and be two players, each choosing strategies from their respective strategy set and
- (ii)
- The strategy space is equipped with -space by defining the distance function m as follows:This space models the closedness of the strategies.
- (iii)
- The payoff functions are for player and for player
- (iv)
- A Nash equilibrium occurs at the strategy pair such that no player can improve their payoff by unilaterally changing their strategy:
- 1
- for player
- 2
- for player
- ・
- If both players choose , they both obtain a payoff of which is a mutually beneficial outcome.
- ・
- If chooses and chooses B, , gets 0 and gets
- ・
- The other combinations yield lower payoffs for at least one player.
- ・
- Best Response of Player :
- ・
- Given , the best response of is (since ).
- ・
- Given , the best response of is (since ).
- ・
- Best Response of Player
- ・
- Given , the best response of player is (since ).
- ・
- Given , the best response of player is (since ).
- (i)
- A sequence in -space converges with respect to to k if and only if
- (ii)
- A sequence in -space is called m-Cauchy ifexist (and are finite).
- (iii)
- A space is said to be complete if every m-Cauchy in ξ is m-convergent with respect to to k in ξ such that
- (iv)
- A sequence is a Cauchy sequence in if and only if it is a Cauchy sequence in the metric space
- (v)
- A space is complete if and only if is complete.
- (ii)
- A sequence in is called 0-Cauchy sequence if
- (iii)
- A space is said to be 0-complete if every 0-Cauchy sequence in ξ is convergent with respect to to k in ξ such that
- (i)
- A self-mapping on a -space is called a m-Caristi mapping if there is a function ξ with lower semicontinuity in the setup of , and it satisfies the inequality
- (ii)
- Self-mapping on an -space is called a m-Caristi mapping if there is a function ξ with lower semicontinuity in , and it satisfies the inequality
- () F is strictly increasing and continuous.
- () For any sequence ,
2. Main Results
- (i)
- , for all
- (ii)
- ∀, for all
3. Coupled Fixed-Point Results in M-Metric Spaces
- (i)
- (a)
- If a is a nondecreasing sequence in ξ such that for all , and , then
- (b)
- If a is a nonincreasing sequence in ξ such that for all and , then
- (i)
- (i)
4. Solution of Some Non-Cooperative Equilibrium Problems of Two Persons
- (i)
- and represent strategies for the first and second players, respectively;
- (ii)
- The denotes the set of allowed strategy pairs;
- (iii)
- The biloss operator is as follows:,where represents the loss acquired by player j when strategies and are employed, assuming that there exist maps and , which are optimal decision rules.As mentioned before, any solution to the system
- (i)
- (i)
5. Tripled Fixed-Points in M-Metric Spaces
- (i)
6. Certain Non-Cooperative Equilibrium Problems Involving Three Players
- (i)
- , , represent strategies for the first, second, and third players, respectively;
- (ii)
- The denotes the set of allowed strategy pairs;
- (iii)
- We define a triloss operator as follows:This implies thatTo determine the strategy pairs that succeed as non-cooperative equilibria, we examine the optimal decision rules and , defined as follows:Consider the any fixed-point mapping
- (i)
- (i)
7. Solution of an Integral Equation
- (i)
- The unknown function k is real-valued,
- (ii)
- are increasing and decreasing functions, respectively, where:
- (iii)
- is a continuous function,
- (iv)
- , where , and and for all such that
- (v)
- there exists such that
8. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
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Iteration Player | Iteration Player | Player 1 Strategy | Player 2 Strategy |
---|---|---|---|
0 | 1 | ||
1 | 2 | ||
2 | 3 | ||
3 | 4 | ||
4 | 5 | ||
5 | 6 | ||
6 | 7 | ||
…, | …, | …, | …, |
17 | 18 | ||
18 | 19 | ||
19 | 20 |
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Tariq, M.; Mansour, S.; Abbas, M.; Assiry, A. A Solution to the Non-Cooperative Equilibrium Problem for Two and Three Players Using the Fixed-Point Technique. Symmetry 2025, 17, 544. https://doi.org/10.3390/sym17040544
Tariq M, Mansour S, Abbas M, Assiry A. A Solution to the Non-Cooperative Equilibrium Problem for Two and Three Players Using the Fixed-Point Technique. Symmetry. 2025; 17(4):544. https://doi.org/10.3390/sym17040544
Chicago/Turabian StyleTariq, Muhammad, Sabeur Mansour, Mujahid Abbas, and Abdullah Assiry. 2025. "A Solution to the Non-Cooperative Equilibrium Problem for Two and Three Players Using the Fixed-Point Technique" Symmetry 17, no. 4: 544. https://doi.org/10.3390/sym17040544
APA StyleTariq, M., Mansour, S., Abbas, M., & Assiry, A. (2025). A Solution to the Non-Cooperative Equilibrium Problem for Two and Three Players Using the Fixed-Point Technique. Symmetry, 17(4), 544. https://doi.org/10.3390/sym17040544