Homework Answers
False. It is possible to draw a simple y-monotone polygon that has a triangulation which gives a dual that is not a chain. Here is one counterexample:
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3.3 Prove or disprove: The dual graph of the triangulation of a monotone polygon is always a chai...
Prove or disprove the following: For any (non-directed) graph, the number of odd-degree nodes is even....
Prove or disprove the following: For any (non-directed) graph, the number of odd-degree nodes is even. In a minimally connected graph of n>2 nodes with exactly k nodes of degree 1 , 1<k<n. I.e., you cannot have a minimally connected graph with 1 node of degree 1 or n nodes of degree 1.
Prove/ Disprove : If A and B are any two events, then it is always true...
Prove/ Disprove : If A and B are any two events, then it is always true that P (A ∪ B) ≤ P (A) + P (B)
Prove or disprove that INDEPENDENT-SET ?p SET-PACKING, that is, these two problems are computationally equally hard....
Prove or disprove that INDEPENDENT-SET ?p SET-PACKING, that is,
these two problems are computationally equally hard. Please use an
illustration if it helps. The definitions of these two decision
problems are summarized below. We already proved that
INDEPENDENT-SET ?p SETPACKING, so assume this given.
- INDEPENDENT-SET: Given a graph G = (V, E) and an integer k, is
there a subset of vertices such that and, for each edge in
E, at most one - but not both - of...
For Problems C4-C11, prove or disprove the statement. C4 If V is an n-dimensional vector space...
For Problems C4-C11, prove or disprove the statement. C4 If V is an n-dimensional vector space and {11,...,Vk} is a linearly independent set in V, then k sn. C5 Every basis for P2(R) has exactly two vectors in it. C6 If {V1, V2} is a basis for a 2-dimensional vector space V, then {ağı + bū2, cũı + dv2} is also a basis for V for any non-zero real numbers a,b,c,d.
1. Use Pigeon hole principle to prove that any graph with at least 2 vertices contains...
1. Use Pigeon hole principle to prove that any graph with at
least 2 vertices contains two vertices of the same degree. (Hint:
Prove by contradiction. (4 points)
2. Given (6 Points)
a. Prove the above equation using binomial theorem. (3
Points)
b. Give a combinatorial proof for the given equating. (3
Points)
4n = (0)2" + (1)2" +...+)2"-
Graph 2 Prove the following statements using one example for each (consider n > 5). (a)...
Graph 2 Prove the following statements using one example for each (consider n > 5). (a) A graph G is bipartite if and only if it has no odd cycles. (b) The number of edges in a bipartite graph with n vertices is at most (n2 /2). (c) Given any two vertices u and v of a graph G, every u–v walk contains a u–v path. (d) A simple graph with n vertices and k components can have at most...
3. A Unicvcle Problem Prove that a cycle exists in an undirected graph if and only...
3. A Unicvcle Problem Prove that a cycle exists in an undirected graph if and only if a BFS of that graph has a cross-edge. (**) Your proof may use the following facts from graph theory . There exists a unique path between any two vertices of a tree. . Adding any edge to a tree creates a unique cycle.
Please write your answer clearly and easy to read. Please only answer the ones you can....
Please write your answer clearly and easy to read.
Please only answer the ones you can. I will upvote all the
submitted answers.
Question 5. Prove by contradiction that every circuit of length at least 3 contains a cycle Question 6. Prove or disprove: There exists a connected graph of order 6 in which the distance between any two vertices is even Question 7. Prove formally: If a graph G has the property that every edge in G joins a...
X) (4 points) If k is a positive integer, a k-coloring of a graph G is an assignment of one of k ...
COMP Discrete Structures: Please answer completely and
clearly.
(3).
(5).
x) (4 points) If k is a positive integer, a k-coloring of a graph G is an assignment of one of k possible colors to each of the vertices/edges of G so that adjacent vertices/edges have different colors. Draw pictures of each of the following (a) A 4-coloring of the edges of the Petersen graph. (b) A 3-coloring of the vertices of the Petersen graph. (e) A 2-coloring (d) A...
Recall the definition of the degree of a vertex in a graph. a) Suppose a graph has 7 vertices, each of degree 2 or 3. Is the graph necessarily connected ? b) Now the graph has 7 vertices, each degree...
Recall the definition of the degree of a vertex in a graph. a)
Suppose a graph has 7 vertices, each of degree 2 or 3. Is the graph
necessarily connected ?
b) Now the graph has 7 vertices, each degree 3 or 4. Is it
necessarily connected?
My professor gave an example in class. He said triangle and a
square are graph which are not connected yet each vertex has degree
2.
(Paul Zeitz, The Art and Craft of Problem...
Prove or disprove that INDEPENDENT-SET ?p SET-PACKING, that is,
these two problems are computationally equally hard. Please use an
illustration if it helps. The definitions of these two decision
problems are summarized below. We already proved that
INDEPENDENT-SET ?p SETPACKING, so assume this given.
- INDEPENDENT-SET: Given a graph G = (V, E) and an integer k, is
there a subset of vertices such that and, for each edge in
E, at most one - but not both - of...
For Problems C4-C11, prove or disprove the statement. C4 If V is an n-dimensional vector space and {11,...,Vk} is a linearly independent set in V, then k sn. C5 Every basis for P2(R) has exactly two vectors in it. C6 If {V1, V2} is a basis for a 2-dimensional vector space V, then {ağı + bū2, cũı + dv2} is also a basis for V for any non-zero real numbers a,b,c,d.
1. Use Pigeon hole principle to prove that any graph with at
least 2 vertices contains two vertices of the same degree. (Hint:
Prove by contradiction. (4 points)
2. Given (6 Points)
a. Prove the above equation using binomial theorem. (3
Points)
b. Give a combinatorial proof for the given equating. (3
Points)
4n = (0)2" + (1)2" +...+)2"-
3. A Unicvcle Problem Prove that a cycle exists in an undirected graph if and only if a BFS of that graph has a cross-edge. (**) Your proof may use the following facts from graph theory . There exists a unique path between any two vertices of a tree. . Adding any edge to a tree creates a unique cycle.
Please write your answer clearly and easy to read.
Please only answer the ones you can. I will upvote all the
submitted answers.
Question 5. Prove by contradiction that every circuit of length at least 3 contains a cycle Question 6. Prove or disprove: There exists a connected graph of order 6 in which the distance between any two vertices is even Question 7. Prove formally: If a graph G has the property that every edge in G joins a...
COMP Discrete Structures: Please answer completely and
clearly.
(3).
(5).
x) (4 points) If k is a positive integer, a k-coloring of a graph G is an assignment of one of k possible colors to each of the vertices/edges of G so that adjacent vertices/edges have different colors. Draw pictures of each of the following (a) A 4-coloring of the edges of the Petersen graph. (b) A 3-coloring of the vertices of the Petersen graph. (e) A 2-coloring (d) A...
Recall the definition of the degree of a vertex in a graph. a)
Suppose a graph has 7 vertices, each of degree 2 or 3. Is the graph
necessarily connected ?
b) Now the graph has 7 vertices, each degree 3 or 4. Is it
necessarily connected?
My professor gave an example in class. He said triangle and a
square are graph which are not connected yet each vertex has degree
2.
(Paul Zeitz, The Art and Craft of Problem...
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