<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$T_\Omega$"><mml:mrow><mml:msub><mml:mi>T</mml:mi><mml:mi>Ω</mml:mi></mml:msub></mml:mrow></mml:math>-sequences in abelian groups
International journal of mathematics and mathematical sciences