We consider an interesting consequence of the closed graph the- orem. A linear map P from a linear space X to itself is called a projection if P² = P. If P is a projection, then so is I - P and R(P) = Z(I – P), Z(P) = R(I-P). It follows that X = R(P) +Z(P) and R(P) Z(P) = {0} for every projection P defined on X. Conversely, if Y and Z are subspaces of X such that X = Y + Z and YnZ = {0}, then for every x € X there are unique y € Y and z € Z such that x = y + z, so that the linear map given by P(x) = y is a projection. It is called the projection onto Y along Z. Request clarity underlined part what is Z? Is I the identity map?
We consider an interesting consequence of the closed graph the- orem. A linear map P from a linear space X to itself is called a projection if P² = P. If P is a projection, then so is I - P and R(P) = Z(I – P), Z(P) = R(I-P). It follows that X = R(P) +Z(P) and R(P) Z(P) = {0} for every projection P defined on X. Conversely, if Y and Z are subspaces of X such that X = Y + Z and YnZ = {0}, then for every x € X there are unique y € Y and z € Z such that x = y + z, so that the linear map given by P(x) = y is a projection. It is called the projection onto Y along Z. Request clarity underlined part what is Z? Is I the identity map?
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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![We consider an interesting consequence of the closed graph the-
orem. A linear map P from a linear space X to itself is called a
projection if P² = P. If P is a projection, then so is I - P and
R(P) = Z(I – P), Z(P) = R(I – P). It follows that
X = R(P) + Z(P) and R(P) Z(P) = {0}
for every projection P defined on X. Conversely, if Y and Z are
subspaces of X such that X = Y+Z and YnZ = {0}, then for every
€ X there are unique y € Y and z € Z such that x = y + z, so
that the linear map given by P(x) = y is a projection. It is called the
projection onto Y along Z.
Request clarity underlined Rail
what is Z? Is I the identity map?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe15b7304-cc73-4505-92c3-23aa2fda4f71%2F1ae6c7c1-8320-4685-a8d0-765eaf30ccc4%2F8jc8y3_processed.png&w=3840&q=75)
Transcribed Image Text:We consider an interesting consequence of the closed graph the-
orem. A linear map P from a linear space X to itself is called a
projection if P² = P. If P is a projection, then so is I - P and
R(P) = Z(I – P), Z(P) = R(I – P). It follows that
X = R(P) + Z(P) and R(P) Z(P) = {0}
for every projection P defined on X. Conversely, if Y and Z are
subspaces of X such that X = Y+Z and YnZ = {0}, then for every
€ X there are unique y € Y and z € Z such that x = y + z, so
that the linear map given by P(x) = y is a projection. It is called the
projection onto Y along Z.
Request clarity underlined Rail
what is Z? Is I the identity map?
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