数学代码代写 MT4512代写 自动机、语言和复杂性代写
597MT4512 Automata, Languages and Complexity 数学代码代写 EXAM DURATION: 2 hours EXAM INSTRUCTIONS: Attempt ALL questions. The number in square brackets shows the maximum marks obtainable for tha...
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离散数学与图论代写 Practice Class 4 1. Give recursive definitions of the following sequences. (a) The sequence of powers of 2: 20 = 1, and for n ≥ 1, _
1. Give recursive definitions of the following sequences.
(a) The sequence of powers of 2: 20 = 1, and for n ≥ 1, _______
(b) The Catalan numbers: c0 = 1, and for n ≥ 1, _______
What is the correct order of the lines?
3. Consider the sequence defined by a0 = 0, an = an−1 + 2n for n ≥ 1.
(a) Unravelling gives the non-closed formula _______
(b) Summing the arithmetic progression gives the closed formula _______
(c) Check that the formula in the previous part satisfies the recurrence relation: _______
4. Consider the recurrence relation an = an−1 + 6an−2, for n ≥ 2.
(a) What is the characteristic polynomial?
(b) What are the roots of this polynomial? 离散数学与图论代写
(c) Write down the general solution: _______
(d) Find the solution when a0 = 1, a1 = −1:_______
5. Consider the recurrence relation an = −2an−1 − an−2, for n ≥ 2.
(a) What is the characteristic polynomial?
(b) What are the roots of this polynomial?
(c) Write down the general solution: _______
(d) Find the solution when a0 = 1, a1 = −3: _______
6. Consider the recurrence relation an = −an−2, for n ≥ 2.
(a) What is the characteristic polynomial?
(b) What are the roots of this polynomial?
(c) Write down the general solution: _______
(d) If a0 = 0 and a1 = 1, what is a7?
1. Consider the recurrence relation an = 4an−1 − 4an−2 + 3n + 2, for n ≥ 2.
(a) If pn is a particular solution of this recurrence, the general solution is _______ where bn is a general solution of the homogeneous recurrence relation, i.e.
bn = 4bn−1 − 4bn−2.
(b) The characteristic polynomial of the homogeneous recurrence is x2 − 4x + 4.
Hence _______
(c) A particular solution of the form pn = An + B is _______
(d) Find the solution of the original recurrence when a0 = 15, a1 = 21: _______
2. Write down the general solution of each of the following recurrence relations, by finding a particular solution of the stated form.
(a) an = 3an−1 + 2 for n ≥ 1; pn = A.
(b) an = 2an−1 + n + 1 for n ≥ 1; pn = An + B.
(c) an = 3an−1 − 2n for n ≥ 1; pn = A2n.
4.For each of the sequences (a)–(g), write the number (i)–(vii) of its generating function.
(a) 1, 2, 22 , 23 , · · · _______
(b) 1, 1, 1, 1, · · · _______
(c) 3, 2, 1, 0, 0, 0, · · · _______
(d) 1, 2, 3, 4, 5, · · · _______
(e) 0, 1, 2, 3, 4, · · · _______
(f) 0, 0, 1, 2, 3, 4, · · · _______
(g) 2, 3, 4, 5, 6, · · · _______
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