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  2. Why a complete graph has $\\frac{n(n-1)}{2}$ edges?

    math.stackexchange.com/questions/17747

    A simpler answer without binomials: A complete graph means that every vertex is connected with every other vertex. If you take one vertex of your graph, you therefore have n − 1 n − 1 outgoing edges from that particular vertex. Now, you have n n vertices in total, so you might be tempted to say that there are n(n − 1) n (n − 1) edges in ...

  3. Every complete graph is also a simple graph. However, between any two distinct vertices of a complete graph, there is always exactly one edge; between any two distinct vertices of a simple graph, there is always at most one edge.

  4. Eigenvalues of a Complete graph - Mathematics Stack Exchange

    math.stackexchange.com/questions/1423024

    It's worth adding that the eigenvalues of the Laplacian matrix of a complete graph are 0 0 with multiplicity 1 1 and n n with multiplicity n − 1 n − 1. Recall that the Laplacian matrix for graph G G is. LG = D − A L G = D − A. where D D is the diagonal degree matrix of the graph. For Kn K n, this has n − 1 n − 1 on the diagonal, and ...

  5. How many Hamiltonian cycles are there in a complete graph

    math.stackexchange.com/questions/249817

    I can see why you would think that. For n=5 (say a,b,c,d,e) there are in fact n! unique permutations of those letters.

  6. Subgraphs of Complete graphs - Mathematics Stack Exchange

    math.stackexchange.com/questions/472450

    You need to consider two thinks, the first number of edges in a graph not addressed is given by this equation Combination(n,2) becuase you must combine all the nodes in couples, In addition you need two thing in the possibility to have addressed graphs, in this case the number of edges is given by the Permutation(n,2) because in this case the order is important.

  7. Standard notation for the complete graph with self-loops?

    math.stackexchange.com/questions/2828455/standard-notation-for-the-complete...

    You could just write the complete graph with self-loops on n n vertices as K¯n K ¯ n. In any event if there is any doubt whether or not something is standard notation or not, define explicitly. I'd even specify Kn K n explicitly as the complete graph on n n vertices to remove any ambiguity. – Mike. Jun 22, 2018 at 15:53.

  8. a regular graph has 15 edges, how many vertices does it have?

    math.stackexchange.com/questions/1494467

    It's not true that in a regular graph, the degree is $|V| - 1$. The degree can be 1 (a bunch of isolated edges) or 2 (any cycle) etc. In a complete graph, the degree of each vertex is $|V| - 1$. Your argument is correct, assuming you are dealing with connected simple graphs (no multiple edges.)

  9. Finding the number of Spanning Trees of a Graph $G$

    math.stackexchange.com/questions/90950

    Yes there is. If it is a complete graph, and it must be a complete graph, the number of spanning trees is nn−2 n n − 2 where n n is the number of nodes. For instance a comple graph with 5 5 nodes should produce 53 5 3 spanning trees and a complete graph with 4 4 nodes should produce 42 4 2 spanning trees.I do not know of a complete graph ...

  10. What is the degree of a vertex in the complete graph $K_n$?

    math.stackexchange.com/questions/3124173/what-is-the-degree-of-a-vertex-in-the...

    Because every two points are connected in a complete graph, each individual point is connected with every other point in the group of n points. There is a connection between every two points. There is a connection between every two points.

  11. Total number paths between two nodes in a complete graph

    math.stackexchange.com/questions/2406920/total-number-paths-between-two-nodes...

    15. In a complete graph total number of paths between two nodes is equal to: $\lfloor (P-2)!e\rfloor$. This formula doesn't make sense for me at all, specially I don't know how $ {e}$ plays a role in this formula. could anyone prove that simply with enough explanation? graph-theory. Share. Cite.