(a) Let A = B(X) where X is a Banach space. Suppose there exists m >0 such that ||Ax|| ≥ m||x||, Vx € X. Show that Image A is closed in X. (b) Let A = B(H) be self adjoint, where H is a Hilbert space. Let λ EC such that Imλ 0. Prove that || Ax − Ax|| ≥ |Im\| ||x||, Vx € H. Prove that X is a regular point of A.

Elementary Linear Algebra (MindTap Course List)
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Chapter4: Vector Spaces
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(a) Let A = B(X) where X is a Banach space. Suppose there exists m >0 such
that
||Ax|| ≥ m||x||, Vx € X.
Show that Image A is closed in X.
(b) Let A = B(H) be self adjoint, where H is a Hilbert space. Let λ = C such
that Imλ ‡0. Prove that
|| Ax − λx|| ≥ |Im\| ||x||, Vx € H.
ɛ
1.
Prove that X is a regular point of A.
Transcribed Image Text:(a) Let A = B(X) where X is a Banach space. Suppose there exists m >0 such that ||Ax|| ≥ m||x||, Vx € X. Show that Image A is closed in X. (b) Let A = B(H) be self adjoint, where H is a Hilbert space. Let λ = C such that Imλ ‡0. Prove that || Ax − λx|| ≥ |Im\| ||x||, Vx € H. ɛ 1. Prove that X is a regular point of A.
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