THEOREM 4.2. Let l, k and t are both even positive integers then for all B, a, a, b and c are positive real numbers, then Eq. (1) has no positive prime period two solution. Proof: Let that there exists distinct positive solution P and Q, such that ....Р, Q, Р, Q, ..., is a prime period two solution of Eq.(1). We see from Eq. (1) when l, k and t are both even, then rn+1 = P and rn-l = xn-k = xn-t = Q. It follows Eq. (1) that P = BQ + aQ + 1. and Q = BP+ aP+ . 6P+c* Therefore, bPQ + cP = b(B +a)Q? + (a + c(B+a))Q, (14) bPQ + cQ = b(B+a)P² + (a + c(B + a))P, (15) Subtracting (15) from (14) gives P+Q = a+c(1+8+a) b(8+a) (16) Again, adding (14) and (15) yields PQ = c(a+c(1+3+a)). (B+a)(1+B+a) (17) From (16) and (17), we have (P+Q) PQ c(a+c(1+B+a)+c)² b (8+a)²(1+B+a) < 0 = - This contradicts the hypothesis that both P and Q are positive. Thus, the proof is now completed.
THEOREM 4.2. Let l, k and t are both even positive integers then for all B, a, a, b and c are positive real numbers, then Eq. (1) has no positive prime period two solution. Proof: Let that there exists distinct positive solution P and Q, such that ....Р, Q, Р, Q, ..., is a prime period two solution of Eq.(1). We see from Eq. (1) when l, k and t are both even, then rn+1 = P and rn-l = xn-k = xn-t = Q. It follows Eq. (1) that P = BQ + aQ + 1. and Q = BP+ aP+ . 6P+c* Therefore, bPQ + cP = b(B +a)Q? + (a + c(B+a))Q, (14) bPQ + cQ = b(B+a)P² + (a + c(B + a))P, (15) Subtracting (15) from (14) gives P+Q = a+c(1+8+a) b(8+a) (16) Again, adding (14) and (15) yields PQ = c(a+c(1+3+a)). (B+a)(1+B+a) (17) From (16) and (17), we have (P+Q) PQ c(a+c(1+B+a)+c)² b (8+a)²(1+B+a) < 0 = - This contradicts the hypothesis that both P and Q are positive. Thus, the proof is now completed.
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.4: Mathematical Induction
Problem 42E
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