a:[0,oo)->R is a continous and bounded and x′(t) =(0 1, -a(t) 0) x(t) has a non-zero solution like y(t) such that limt->ooy(t)=0. Show that this equation has an unbounded solution on [0,oo).

linnibell17591

linnibell17591

Answered question

2022-11-16

a : [ 0 , ) R is a continous and bounded and
x ( t )   = ( 0 1 a ( t ) 0 )   x ( t )
has a non-zero solution like y ( t ) such that lim t y ( t ) = 0.
Show that this equation has an unbounded solution on [ 0 , ).

Answer & Explanation

Milton Gilmore

Milton Gilmore

Beginner2022-11-17Added 20 answers

MathJax(?): Can't find handler for document MathJax(?): Can't find handler for document Let X = ( x 1 , x 2 ) and y = ( y 1 , y 2 ). The system can be written as the second order linear equation
x 1 + a ( t ) x 1 = 0.
We know that it has a solution y1 with lim t y 1 ( t ) = lim t y 1 ( t ) = 0. To find another solution let x 1 = z y 1 . Then
(1) z y 1 + 2 z y 1 + z y 1 a z y 1 = 0 z z = 2 y 1 y 1 z = C y 1 2 .
x 1 ( t ) = y 1 ( t ) 0 t d s ( y 1 ( s ) ) 2
is a solution of equation (1) (and the firs component of ta solution of the system.) #x221E;.

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