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Consider the undirected graph G=(V,E)whereV, the set of nodes, is{1,2,3,4}
andE, the set of edges, is{{1,2},{2,3},{1,3},{2,4},{1,4}}. Draw the graphG. What are the degrees of each node? Indicate a path from node 3 to node 4 on your drawing ofG.

Short Answer

Expert verified

Below is the Graph G,

The degree of each node is as follows:

  • Node 1 has degree 3.
  • Node 2 has degree 3.
  • Node 3 has degree 2.
  • Node 4 has degree 2.

The path from node 3 to node 4 is shown below using the blue color:

Step by step solution

01

Describe the steps taken to draw the graph.

  1. Draw four circles as the nodes of the graph and number them.
  2. Connect nodes with a line for which there is an ordered pair in set E. For instance, (1,2) is given in the set, so make node 1 and node 2 connected.
02

Describe the degree of each node

A degree can be defined as the number of incoming or outgoing edges to a node.

  • There are 3 edges directly linked to nodes 1 and 2, so their degree is 3.
  • There are 2 edges directly linked to nodes 3 and 4, so their degree is 2.
03

Describe the path from node 3 to node 4

A path can be defined as the set of connected edges through which we can reach from one node to another node.

There can be many possible paths from node 3 to node 4, some are as follows:

3→2→43→1→43→1→2→43→2→1→4

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Most popular questions from this chapter

A two-dimensional finite automaton (2DIM-DFA) is defined as follows. The input is an m×nrectangle, for any m,n≥2. The squares along the boundary of the rectangle contain the symbol # and the internal squares contain symbols over the input alphabet ∑. The transition function δ:Q×∑∪#→Q×L,R,U,Dindicates the next state and the new head position (Left, Right, Up, Down). The machine accepts when it enters one of the designated accept states. It rejects if it tries to move off the input rectangle or if it never halts. Two such machines are equivalent if they accept the same rectangles. Consider the problem of determining whether two of these machines are equivalent. Formulate this problem as a language and show that it is undecidable.

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Let MODEXP={ha,b,c,pi|a,b,c,andpare positive binary integers such that ab≡cmodp}.

Show that MODEXP∈P. (Note that the most obvious algorithm doesn’t run in polynomial time. Hint: Try it first where b is a power of 2 .)

Let

∑3=000,001,010,----,111

∑3contains all size 3 columns of 0s and 1 s. A string of symbols in∑3gives three rows of 0s and 1s. Consider each row to be a binary number and let B=W∈∑*3the bottom row of W is the sum of the top two rows}.

For example,

001,100,010,110∈Bbut001,101∉B

Show that Bis regular.

(Hint: Working with BRis easier. You may assume the result claimed in Problem 1.31.)

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