(a) If x(G) = 1, what can you say about E(G), the edge set of G? (b) Prove that x(Km) = n, where K„ is the complete graph on n vertices. (c) Explain what the function x(G, k) counts, where k e N. (d) If G has no edges, prove that x(G, k) = k".

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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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5. Let G be a graph with n > 1 vertices.
(a) If x(G) = 1, what can you say about E(G), the edge set of G?
(b) Prove that x(Kn) = n, where K, is the complete graph on n vertices.
(c) Explain what the function x(G, k) counts, where k E N.
(d) If G has no edges, prove that x(G, k) = k" .
(e) Using the equation x(G, k) = x(G – e, k) – x(G/e,k), where e is an edge of G, show that
x(G, k) is a polynomial in k of degree n.
(Hint: Strong induction on |E(G)| and use part (d).)
Transcribed Image Text:5. Let G be a graph with n > 1 vertices. (a) If x(G) = 1, what can you say about E(G), the edge set of G? (b) Prove that x(Kn) = n, where K, is the complete graph on n vertices. (c) Explain what the function x(G, k) counts, where k E N. (d) If G has no edges, prove that x(G, k) = k" . (e) Using the equation x(G, k) = x(G – e, k) – x(G/e,k), where e is an edge of G, show that x(G, k) is a polynomial in k of degree n. (Hint: Strong induction on |E(G)| and use part (d).)
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