Prove The range of πk − πk+1 is the same as the range of (πk − πk+1)(Ik − Ik+1). More specifically, it coincides with the range of (I − Qa k+1 )(Ik − Ik+1). Also, any basis {ϕi} of the space Range(Ik − Ik+1) provides a basis of Range(πk − πk+1) defined by {(I − Qa k+1 )ϕi}.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Prove The range of πk − πk+1 is the same as the range of (πk − πk+1)(Ik −
Ik+1). More specifically, it coincides with the range of (I − Qa
k+1
)(Ik − Ik+1). Also,
any basis {ϕi} of the space Range(Ik − Ik+1) provides a basis of Range(πk − πk+1)
defined by {(I − Qa
k+1
)ϕi}.

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