Example #4: a)X(a) 1-ax-1 1+ax-1+(ax-)2+ I-convergent for az< an=aun (b)X( 1 1-a a-12(1+a-1z+(a-12)2+… 2.2 3 l-convergent for a z<1,i.e. 2<Example #4: (a) (b)