Let & ( L ) = 1 - 0.51 + 0.51 2 . Let y ( L ) = 46 + 4 , L + 1/ 2 1 2 + ... be the inverse of & L ) . Compute the values of the first 7 coefficients of y ( L ) : ( Yo .. . V6 ) Is the stability condition satisfied for $ ( L ) ? Is 4 ( L ) absolutely summable