2. Suppose that the functions f1, f2, 91, 92 : N → R20 are such that f₁ = O(91) and ƒ2 € О(92). Prove that (fi + ƒ₂) € ☹(max{91, 92}). Here (f1f2)(n) = fi(n) + f2(n) and max{91, 92}(n) = max{91(n), 92(n)}. 3. Let nЄ N\{0}. Describe the largest set of values n for which you think 2n < n!. Use induction to prove that your description is correct. Here m! stands for m factorial, the product of first m positive integers. 4. Prove that log2 n! = O(n log n).

2. Suppose that the functions f1, f2, 91, 92 : N → R20 are such that f₁ = O(91) and ƒ2 € О(92). Prove that (fi + ƒ₂) € ☹(max{91, 92}). Here (f1f2)(n) = fi(n) + f2(n) and max{91, 92}(n) = max{91(n), 92(n)}. 3. Let nЄ N\{0}. Describe the largest set of values n for which you think 2n < n!. Use induction to prove that your description is correct. Here m! stands for m factorial, the product of first m positive integers. 4. Prove that log2 n! = O(n log n).

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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