TAILIEUCHUNG - BEHAVIOR OF THE POSITIVE SOLUTIONS OF FUZZY MAX-DIFFERENCE EQUATIONS G. STEFANIDOU AND G.

BEHAVIOR OF THE POSITIVE SOLUTIONS OF FUZZY MAX-DIFFERENCE EQUATIONS G. STEFANIDOU AND G. PAPASCHINOPOULOS Received 15 September 2004 We extend some results obtained in 1998 and 1999 by studying the periodicity of the solutions of the fuzzy difference equations xn+1 = max{A/xn ,A/xn−1 ,.,A/xn−k }, xn+1 = max{A0 /xn ,A1 /xn−1 }, where k is a positive integer, A, Ai , i = 0,1, are positive fuzzy numbers, and the initial values xi , i = −k, −k + 1,.,0 (resp., i = −1,0) of the first (resp., second) equation are positive fuzzy numbers. 1. Introduction Difference equations are often used in. | BEHAVIOR OF THE POSITIVE SOLUTIONS OF FUZZY MAX-DIFFERENCE EQUATIONS G. STEFANIDOU AND G. PAPASCHINOPOULOS Received 15 September 2004 We extend some results obtained in 1998 and 1999 by studying the periodicity of the solutions of the fuzzy difference equations xn 1 max A xn A xn-1 . A xn-k xn 1 max A0 xn A1 xn-1 where k is a positive integer A Ai i 0 1 are positive fuzzy numbers and the initial values xi i -k -k 1 . 0 resp. i -1 0 of the first resp. second equation are positive fuzzy numbers. 1. Introduction Difference equations are often used in the study of linear and nonlinear physical physiological and economical problems for partial review see 3 6 . This fact leads to the fast promotion of the theory of difference equations which someone can find for instance in 1 7 9 . More precisely max-difference equations have increasing interest since max operators have applications in automatic control see 2 11 17 18 and the references cited therein . Nowadays a modern and promising approach for engineering social and environmental problems with imprecise uncertain input-output data arises the fuzzy approach. This is an expectable effect since fuzzy logic can handle various types of vagueness but particularly vagueness related to human linguistic and thinking for partial review see 8 12 . The increasing interest in applications of these two scientific fields contributed to the appearance of fuzzy difference equations see 4 5 10 13 14 15 16 . In 17 Szalkai studied the periodicity of the solutions of the ordinary difference equation xn 1 max i xn xn-1 A xn-k where k is a positive integer A is a real constant xi i -k -k 1 . 0 are real numbers. More precisely if A is a positive real constant and xi i -k -k 1 . 0 are positive real numbers he proved that every positive solution of is eventually periodic of period k 2. Copyright 2005 Hindawi Publishing Corporation Advances in Difference Equations 2005 2 2005 153-172 DOI xn 1 max 154 Fuzzy .

TÀI LIỆU LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.