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I I N T R O D U C T I O N A P U R P O S E O F T H I S R E Q U E S T F O R P R O P O S A L S R e g i o n I X E d u c a t i o n C o o p e r a t i v e ( R E C I XWe can check that PTP= I n by a lengthy computation, or more simply, notice that (P TP) ij = 0 B @ uT 1 u 2 uT 3 1 C A u 1 u 2 u 3 = 0 B @ 1 0 0 0 1 0 0 0 1 1 C A We are using orthonormality of the u i for the matrix multiplication above Orthonormal Change of Basis and Diagonal MatricesZ ( } o W Z W l l o Ì } } } X P v Ç X } u l µ o lZW µ Ç ó íy, ì Yh ^d/KE l E^t Z^ í X d Z } µ u v v Z î v Á ó ì u l Z } µ o v o o v Z v o o o 重生明珠 七和香 —â"€ƒAƒXƒpƒ‰ ƒŒƒVƒs ‚¨•Ù"–