In Problems 19-24, convert the given second-order equation into a first-order system by setting υ = y ′ . Then find all the critical points in the y υ -plane. Finally, sketch (by hand or software) the direction fields, and describe the stability of the critical points (i.e., compare with Figure 5.12 ). y ″ ( t ) + y ( t ) − y ( t ) 3 = 0
In Problems 19-24, convert the given second-order equation into a first-order system by setting υ = y ′ . Then find all the critical points in the y υ -plane. Finally, sketch (by hand or software) the direction fields, and describe the stability of the critical points (i.e., compare with Figure 5.12 ). y ″ ( t ) + y ( t ) − y ( t ) 3 = 0
In Problems 19-24, convert the given second-order equation into a first-order system by setting
υ
=
y
′
. Then find all the critical points in the
y
υ
-plane. Finally, sketch (by hand or software) the direction fields, and describe the stability of the critical points (i.e., compare with Figure 5.12).
Q1: A: Let M and N be two subspace of finite dimension linear space X, show that if M = N
then dim M = dim N but the converse need not to be true.
B: Let A and B two balanced subsets of a linear space X, show that whether An B and
AUB are balanced sets or nor.
Q2: Answer only two
A:Let M be a subset of a linear space X, show that M is a hyperplane of X iff there exists
ƒ€ X'/{0} and a € F such that M = (x = x/f&x) = x}.
fe
B:Show that every two norms on finite dimension linear space are equivalent
C: Let f be a linear function from a normed space X in to a normed space Y, show that
continuous at x, E X iff for any sequence (x) in X converge to Xo then the sequence
(f(x)) converge to (f(x)) in Y.
Q3: A:Let M be a closed subspace of a normed space X, constract a linear space X/M as
normed space
B: Let A be a finite dimension subspace of a Banach space X, show that A is closed.
C: Show that every finite dimension normed space is Banach space.
Chapter 5 Solutions
Fundamentals of Differential Equations and Boundary Value Problems
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