5. Let G=(V, E) be a graph with n > 3 vertices. (a) Define a relation on V by "ry if and only if there is a walk between r and y". Prove that is an equivalence relation on V.
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- In each of the following parts, a relation is defined on the set of all human beings. Determine whether the relation is reflective, symmetric, or transitive. Justify your answers. xRy if and only if x lives within 400 miles of y. xRy if and only if x is the father of y. xRy if and only if x is a first cousin of y. xRy if and only if x and y were born in the same year. xRy if and only if x and y have the same mother. xRy if and only if x and y have the same hair colour.Draw a directed graph diagram for relation S on {0, 1, 2, 3,4}, where TSy iff x + y = 4Let G be an undirected graph with a loop at every vertex.Show that the relation R on the set of vertices of G suchthat uRv if and only if there is an edge associated to {u, v}is a symmetric, reflexive relation on G.
- Let A = {a, b, c, d} and define a relation R on A.Match the following directed graphs with its correct relation.Let G be a simple graph. Show that the relation R on theset of vertices of G such that uRv if and only if there isan edge associated to {u, v} is a symmetric, irreflexiverelation on G.Prove that the following ~ is an equivalence relation: Suppose W = (X,Y) is a graph. We define the relation ~ on X to be that x~y if and only if there exists a walk in W from x to y.
- Let G be a connected graph with at least one edge and F ⊆ E(G) be an edge cut. Prove that F is a minimal edge cut if and only if G − F contains exactly two connected components.Draw the directed graphs of the relation.Let A = {6, 8, 13, 15, 9, 16} and define a relation R on A as follows: xRy ⟺ 7 |(x – y) Draw a directed graph for R.
- Prove : for r belongs to Z+, every r connected graph on an even number of vertices with no induced subgraph isomorphic to k1,r+1 has a 1-factor. Show that this is not true if you replace r connected by r edge connectedSuppose R1 is a relation on domain X1 and R2 is a relation on domain X2 Define a new relation R whose domain is X1×X2: (x1,x2)R(x1′,x2′) if x1R1x1′ and x2R2x2′. (a) Show that if R1 and R2 are both partial orders, then R is also a partial order. (b) Now change the relation R so that (x1,x2)R(x1′,x2′) if x1R1x1′ OR x2R2x2′. Give an example in which R1 and R2 are partial orders but R is not a partial order.True or False? For every nonempty set A, there exists a relation R which is both an equivalence relationand a partial ordering on A.