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Title: The Computational Complexity of 3k-CLIQUE
Title: The Computational Complexity of 3k-CLIQUE


Research Question: What is the minimum time complexity required for a deterministic and exact algorithm to solve the 3k-CLIQUE problem, which involves finding a clique of size 3k in a given undirected graph?
Research Question: What is the minimum time complexity required for a deterministic and exact algorithm to solve the 3k-CLIQUE problem on a classical computer?


Methodology: The study proposes a method to create an auxiliary graph G′ with O(nk) vertices and O(n2k) edges. The 3-CLIQUE problem on G′ is equivalent to the 3k-CLIQUE problem on the original graph G. The Hadamard product of the adjacency matrix of G′ is used to determine if there is a 3-clique in the graph.
Methodology: The study uses graph theory and matrix theory to propose a method for solving the 3k-CLIQUE problem. It creates an auxiliary graph G' with O(nk) vertices and O(n2k) edges, equivalent to the 3-CLIQUE problem on the original graph G. The study then proposes a way to determine if there exists a 3-clique in G' by checking if a certain equation holds true for each pair of vertices.


Results: The main result is that the fastest deterministic and exact algorithm that solves the 3k-CLIQUE problem must run in Ω( n2k) time in the worst-case scenario on a classical computer, where n is the number of vertices in the graph. This lower bound is confirmed by the fact that the fastest known deterministic and exact algorithm that solves 3k-CLIQUE was published in 1985 and has a running time of Θ( nωk), where ω ≥ 2.
Results: The main result is that any deterministic and exact algorithm that does not use an oracle must take Ω(n2k) time in the worst-case scenario to solve the 3k-CLIQUE problem. This is because there are adjacency matrices with Θ(n2k) indices such that the equation holds true, but only a constant number of indices have the equation hold false.


Implications: This research has significant implications for the field of computational complexity. It sets a lower bound on the time complexity for solving the 3k-CLIQUE problem, which has practical applications in various areas of computer science and mathematics. The results also contribute to our understanding of the limits of deterministic algorithms and the nature of NP-complete problems.
Implications: This lower bound on the time complexity implies that P/∧≠NP, meaning that there are problems that are inherently harder to solve approximately than exactly. This is a significant result in the field of computational complexity.


Link to Article: https://arxiv.org/abs/0310060v13
In conclusion, the study shows that determining if a 3k-clique exists in a graph requires at least Ω(n2k) time in the worst-case scenario for a deterministic and exact algorithm. This lower bound holds even for the fastest known algorithms, implying that some problems are fundamentally harder to solve than others.
 
Link to Article: https://arxiv.org/abs/0310060v14
Authors:  
Authors:  
arXiv ID: 0310060v13
arXiv ID: 0310060v14


[[Category:Computer Science]]
[[Category:Computer Science]]
[[Category:Clique]]
[[Category:Clique]]
[[Category:3K]]
[[Category:3K]]
[[Category:Problem]]
[[Category:Graph]]
[[Category:Complexity]]
[[Category:Complexity]]
[[Category:Time]]
[[Category:Solve]]

Revision as of 14:46, 24 December 2023

Title: The Computational Complexity of 3k-CLIQUE

Research Question: What is the minimum time complexity required for a deterministic and exact algorithm to solve the 3k-CLIQUE problem on a classical computer?

Methodology: The study uses graph theory and matrix theory to propose a method for solving the 3k-CLIQUE problem. It creates an auxiliary graph G' with O(nk) vertices and O(n2k) edges, equivalent to the 3-CLIQUE problem on the original graph G. The study then proposes a way to determine if there exists a 3-clique in G' by checking if a certain equation holds true for each pair of vertices.

Results: The main result is that any deterministic and exact algorithm that does not use an oracle must take Ω(n2k) time in the worst-case scenario to solve the 3k-CLIQUE problem. This is because there are adjacency matrices with Θ(n2k) indices such that the equation holds true, but only a constant number of indices have the equation hold false.

Implications: This lower bound on the time complexity implies that P/∧≠NP, meaning that there are problems that are inherently harder to solve approximately than exactly. This is a significant result in the field of computational complexity.

In conclusion, the study shows that determining if a 3k-clique exists in a graph requires at least Ω(n2k) time in the worst-case scenario for a deterministic and exact algorithm. This lower bound holds even for the fastest known algorithms, implying that some problems are fundamentally harder to solve than others.

Link to Article: https://arxiv.org/abs/0310060v14 Authors: arXiv ID: 0310060v14