On rational approximation in a ball in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$\mathbb{C}^N$"><mml:msup><mml:mi>ℂ</mml:mi><mml:mi>N</mml:mi></mml:msup></mml:math>
International journal of mathematics and mathematical sciences