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Equation Icon  ( ) ( ) + 1 0 0 × 0 1 0 𝜖ij = ( 0 − 1 0) ,𝜖ij = ( 1 0 0) , 0 0 0 0 0 0 ( ) ( ) x 0 0 1 y 0 0 0 𝜖ij = ( 0 0 0) ,𝜖ij = ( 0 0 1) , 1 0 0 0 1 0 ( 1 0 0) ( 0 0 0) b ( ) ℓ ( ) 𝜖ij = 0 1 0 ,𝜖ij = 0 0 0 , (53 ) 0 0 0 0 0 1