Abstract

Due to this change, in formula (5) on p. 457 the second term should be positive and the third term should be negative. In the formula on line 15 the second term should be positive and the third term should be negative. On line 17, the coefficient of Au is then ( 1 + A ) and the second term is negative. Therefore formula (6) should have no coefficient (n 1) on the second term. On p. 457, line 21, there should be no factor (n 1). Line 22 should read Sincen>3 n+2 :0O... On p. 458, line 3 to line 9 should be replaced by: hence, rurr = Ur. Solving this equation we get u(r)= Ir2+d where c and d are two constants. Applying formula (6) to this function u, we can get

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