Prove or disprove the following statements.
(a) There is a simple graph with 6 vertices with...
Prove or disprove the following statements.
(a) There is a simple graph with 6 vertices with degree sequence
(3, 3, 5, 5, 5, 5)?
(b) There is a simple graph with 6 vertices with degree sequence
(2, 3, 3, 4, 5, 5)?
(a) Prove the following claim: in every simple graph G on at
least two vertices, we can always find two distinct vertices v,w
such that deg(v) = deg(w).
(b) Prove the following claim: if G is a simple connected graph
in which the degree of every vertex is even, then we can delete any
edge from G and it will still be connected.
Prove or disprove each of the following statements.
(a) There exists a prime number x such that x + 16 and x + 32
are also prime numbers.
(b) ∀a, b, c, m ∈ Z +, if a ≡ b (mod m), then c a ≡ c b (mod
m).
(c) For any positive odd integer n, 3|n or n 2 ≡ 1 (mod 12).
(d) There exist 100 consecutive composite integers.
Prove or disprove the following statements:
a) If both x2 and x3 are rational, then so
is x.
b) If both x2 and x3 are irrational, then
so is x.
c) If both x+y and xy are rational, then so are x and y.
Prove or disprove the statements: (a) If x is a real number such
that |x + 2| + |x| ≤ 1, then x 2 + 2x − 1 ≤ 2.
(b) If x is a real number such that |x + 2| + |x| ≤ 2, then x 2
+ 2x − 1 ≤ 2.
(c) If x is a real number such that |x + 2| + |x| ≤ 3, then x 2
+ 2x − 1 ≤ 2....
(a) What is the maximum degree of a vertex in a simple graph
with n vertices?
(b) What is the maximum number of edges in a simple graph of
n vertices?
(c) Given a natural number n, does there exist a simple
graph with n vertices and the maximum number of edges?
Question 1
a) Prove that if u and v are distinct vertices of a graph G,
there exists a walk from u to v if and only if there exists a path
(a walk with distinct vertices) from u to v.
b) Prove that a graph is bipartite if and only if it contains no
cycles of odd length.
Please write legibly with step by step details. Many thanks!
let
G be a simple graph. show that the relation R on the set of
vertices of G such that URV if and only if there is an edge
associated with (u,v) is a symmetric irreflexive relation on
G