Rate preservation of double sequences under<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$l\text{-}l$"><mml:mrow><mml:mi>l</mml:mi><mml:mtext>-</mml:mtext><mml:mi>l</mml:mi></mml:mrow></mml:math>type transformation
International journal of mathematics and mathematical sciences