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**Extra info for Temperley-Lieb algebras**

**Example text**

To this end, for any integer m ∈ N, let {t0 , . . 12) as well as symmetry with respect to the origin, in the sense that tm− j = −t j , j = 0, . . , m. 13) m is even. 13) that then tm/2 = 0, if Also, let x ∈ R \ {t0, . . ,tm }. 5), to obtain, for x ∈ R \ {t0,t1 }, ⎡ 1 1 1 ⎣ 1+t12 − 1+t02 f [x,t0 ,t1 ] = − t1 − x t1 − t0 1 1+t02 1 − 1+x 2 t0 − x ⎤ ⎦= x2 − t02 1 , t0 + x (t0 − x)(1 + t02)(1 + x2 ) 40 Mathematics of Approximation and thus f [x,t0 ,t1 ] = − f (x) . 16) whereas ⎡ 1 ⎤ 1 −t0 1 1 ⎣ 1+t22 − 1 1 − 1+t02 ⎦ −t0 − = + f [t0 ,t1 ,t2 ] = f [t0 , 0,t2 ] = , 2 t2 − t0 t2 − 0 0 − t0 2t0 1 + t0 1 + t02 that is, f [t0 ,t1 ,t2 ] = − 1 .

M. 13) m is even. 13) that then tm/2 = 0, if Also, let x ∈ R \ {t0, . . ,tm }. 5), to obtain, for x ∈ R \ {t0,t1 }, ⎡ 1 1 1 ⎣ 1+t12 − 1+t02 f [x,t0 ,t1 ] = − t1 − x t1 − t0 1 1+t02 1 − 1+x 2 t0 − x ⎤ ⎦= x2 − t02 1 , t0 + x (t0 − x)(1 + t02)(1 + x2 ) 40 Mathematics of Approximation and thus f [x,t0 ,t1 ] = − f (x) . 16) whereas ⎡ 1 ⎤ 1 −t0 1 1 ⎣ 1+t22 − 1 1 − 1+t02 ⎦ −t0 − = + f [t0 ,t1 ,t2 ] = f [t0 , 0,t2 ] = , 2 t2 − t0 t2 − 0 0 − t0 2t0 1 + t0 1 + t02 that is, f [t0 ,t1 ,t2 ] = − 1 . 17), as well as t2 = −t0 , that f [x,t0 ,t1 ,t2 ] = x(x + t0 ) 1 t0 x − 1 1 1 − = , − t2 − x x + t0 (1 + t02)(1 + x2 ) 1 + t02 (1 + t02)(1 + x2 ) and thus f [x,t0 ,t1 ,t2 ] = x f (x) .

3. 5) Polynomial Uniform Convergence 39 and choose, for n = 1, 2, . , the interpolation points 10 j x j = xn, j := −5 + , j = 0, . . 6) n that is, {xn, j : j = 0, . . , n} are the uniformly distributed partition points of the interval [−5, 5], with −5 = xn,0 < xn,1 < · · · < xn,n = 5. 7) We proceed to prove the divergence result max EnI (x) := max −5 x 5 −5 x 5 1 − PnI (x) → ∞, 1 + x2 n → ∞. 6). 8). 6), to obtain n EnI (xn ) = f [xn , xn,0 , . . , xn,n ] ∏ (xn − xn, j ), n ∈ N. 11). To this end, for any integer m ∈ N, let {t0 , .