Functional Differential Equations

Functional Differential Equations
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DOI:
10.1007/978-94-017-1630-7_4
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发表时间:
1999
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通讯作者:
A. Kim
A. Kim
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其他
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作者:
A. Kim

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42第四章区分向量17 x(t)和函数延迟18 x(t+ s),-T~ s<0。因此,可以使用以下表格来呈现FDE(4.1. 1)x(t)= f(t,x(t),x(t+ s)),-T~ S< 0,(4.1. 5)其中,在f(“”')下:R x R n x Q [-T,0)--+ R n我们理解作用在空间R x H中的运算符F:R x Q [-T,O]--+ R n(记住空间Hand Q [-T,O]是等距的)。更准确地说,映射f是F和n-1的叠加,即f(t,h)= F [t,n-1(h)],(t,h)ERxH(这里n-1是等距n的逆映射:Q [-T,0]--+ H)。为了找到系统的解决方案(4.1. 5)在每一时刻t,必须知道向量x(t)和函数-史前史x(t+ s),-T~ S<0。因此,系统的相空间(4.1. 5)应该不是有限维空间Rn,而是某个函数空间(函数空间)。在本书中,我们考虑相空间H= Rn x Q [-T,0)中的FDE。空间H= Rn × Q [-T,O]对于区分结构FDE中的有限维和无限维分量是非常方便的。注意,线性FDE通常在希尔伯特空间R n x ε 2 [-T,0)中被考虑,希尔伯特空间R n x ε 2 [-T,0]也是有限维空间R n和
42 CHAPTER 4 distinguish the vector 17 x (t) and the function-delay 18 x (t+ s),-T~ s< O. For this reason one can use the following form to present FDE (4.1. 1) x (t)= f (t, x (t), x (t+ s)),-T~ S< 0,(4.1. 5) where under f (""'): R x R n x Q [-T, 0)--+ R n we understand the operator F: R x Q [-T, O]--+ R n acting in the space R x H (remember that spaces Hand Q [-T, O] are isometric). More precisely, the mapping f is the superposition of F and n-1, ie f (t, h)= F [t, n-1 (h)],(t, h) ERxH (here n-1 is the inverse mapping to isometry n: Q [-T, 0]--+ H). In order to find solutions of system (4.1. 5) it is necessary at every moment t to know the vector x (t) and the function-prehistory x (t+ s),-T~ S< O. For this reason a phase space of system (4.1. 5) should be not finite dimensional space R n, but some functional space (space of functions). In this book we consider FDE in the phase space H= R n x Q [-T, 0). The space H= R n x Q [-T, O) is very convenient for distinguishing finite dimensional and infinite dimensional components in the structure FDE. Note, linear FDE are often considered in the Hilbert space R n x£ 2 [-T, 0) that is also the Cartesian product of the finite dimensional space R n and