discrete mathematics for computer science solutions

... original formula for q. Recall that our proof of the formula we had in Exercise 1.4-5 did not explain why the product of three factorials appeared in the denominator, it simply proved the formula ... distinct elements. There are n choices for the first number in the list. For each way of choosing the first element, there are n −1choices for the second. For each choice of the first two elements, ... the product in the denominator of the formula in Exercise 1.4-5 for the number of labellings with three labels is what it is, and could generalize this formula to four or more labels. Equivalence...

Ngày tải lên: 21/02/2014, 09:20

... truth of mathematics. 2.3 Using Induction Induction is by far the most important proof technique in computer science. Generally, induction is used to prove that some statement holds for all natural ... 1) for all n ∈ N. By the principle of induction, P (n) is true for all n ∈ N, which proves the claim. This proof would look quite mysterious to anyone not privy to the scratchwork we did beforehand. ... divisibility hold. 1. If a | b, then a | bc for all c. 2. If a | b and b | c, then a | c. 3. If a | b and a | c, then a | sb + tc for all s and t. 4. For all c = 0, a | b if and only if ca | cb. Proof....

Ngày tải lên: 05/03/2014, 23:20

... — page i — #1 Mathematics for Computer Science revised Thursday 10 th January, 2013, 00:28 Eric Lehman Google Inc. F Thomson Leighton Department of Mathematics and the Computer Science and AI ... proposition for each possible set of truth values for the variables. For example, the truth table for the proposition “P AND Q” has four lines, since there are four settings of truth values for the ... b for some s 2 Sg: For example, if we let Œr; s denote set of numbers in the interval from r to s on the real line, then f 1 .Œ1; 2/ D Œ1=4; 1. For another example, let’s take the “search for...

Ngày tải lên: 23/03/2014, 23:20

... defined for SO = ao; all n 3 0 .) S, = S-1 + a,, for n > 0. (2.6) Therefore we can evaluate sums in closed form by using the methods we learned in Chapter 1 to solve recurrences in closed form. For ... much happier. That is, we’d like a nice, neat, “closed form” for T,, that lets us compute it quickly, even for large n. With a closed form, we can understand what T,, really is. So how do ... a, 6, and y and trying to find a closed form for the more general recurrence f(1) = cc; f(2n) = 2f(n) + fi, for n 3 1; (1.11) f(2n+1)=2f(n)+y, for n 3 1. (Our original recurrence had...

Ngày tải lên: 14/08/2014, 04:21

Ngày tải lên: 14/08/2014, 04:21

Ngày tải lên: 14/08/2014, 04:21

Ngày tải lên: 14/08/2014, 04:21

Ngày tải lên: 14/08/2014, 04:21

Ngày tải lên: 14/08/2014, 04:21

Ngày tải lên: 14/08/2014, 04:21

Ngày tải lên: 14/08/2014, 04:21

Ngày tải lên: 14/08/2014, 04:21

Ngày tải lên: 14/08/2014, 04:21

Ngày tải lên: 18/12/2013, 15:37

... 170 Introduction to Programming 3 Computers have a fixed set of instructions that they can perform for us. The specific instruction set depends upon the make and model of a computer. However, these instructions ... that the computer always attempts to do precisely what you tell it to do. Say, for example, you tell the computer to divide ten by zero, it tries to do so and fails at once. If you tell the computer ... instructions that tell the computer every step to take in the proper sequence in order to solve a problem for a user. A programmer is one who writes the computer program. When the computer produces a...

Ngày tải lên: 19/03/2014, 14:14

... proof theory and procedures for constructing formal proofs of for- mulae algorithmically. This book is designed primarily for computer scientists, and more gen- erally, for mathematically inclined ... proposition is a Horn formula iff it is a conjunction of basic Horn formulae. (a) Show that every Horn formula A is equivalent to a conjunction of distinct formulae of the form, P i , or ¬P 1 ∨ ... Sharpened Hauptsatz for G2 nnf , 330 7.4.4 The Gentzen System G2 nnf = , 336 7.4.5 A Gentzen-like Sharpened Hauptsatz for G2 nnf = , 337 PROBLEMS, 337 7.5 Herbrand’s Theorem for Prenex Formulae, 338 7.5.1...

Ngày tải lên: 29/03/2014, 09:20

... dreary) proof of this formula by plugging in our earlier formula for binomial coefficients into all three terms and verifying that we get an equality. A guiding principle of discrete mathematics is that when ... equation p(x)=0ofdegree m there are no real numbers for solutions. 11. Let p(x) stand for “x is a prime,” q(x) for “x is even,” and r(x, y) stand for “x = y.” Write down the statement “There is one ... integers for your universe.) 12. Each expression below represents a statement about the integers. Using p(x) for “x is prime,” q(x, y) for “x = y 2 ,” r(x, y) for “x ≤ y,” s(x, y, z) for “z =...

Ngày tải lên: 31/03/2014, 15:58

... of undergraduate computer science curricula and the mathematics which underpins it. Indeed, the whole relationship between mathematics and computer science has changed so that mathematics is now ... Therefore Jack is not a reasonable man. 4. All gamblers are bound for ruin. No one bound for ruin is happy. Therefore no gamblers are happy. 5. All computer scientists are clever or wealthy. No computer ... rigorous way the core mathematics requirement for undergraduate computer science students at British universities and polytechnics. Selections from the material could also form a one- or two- semester...

Ngày tải lên: 31/03/2014, 15:58

... Li Department of Mathematics and Physics, Air Force Engineering University, China jianq_li@263.net Wanbiao Ma Department of Mathematics and Mechanics, School of Applied Science, University of Science ... Sports, Science and Technology, The Japanese Society for Mathematical Biology, The Society of Population Ecology, Mathematical Society of Japan, Japan Society for Industrial and Applied Mathematics, ... according to the ideas of constructing population models with discrete age structure and the epidemic compartment model, we form an SIS model with discrete age structure as follows: ⎧ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎨ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎪ ⎩ S 0 (t...

Ngày tải lên: 27/06/2014, 10:20