On properties of fuzzy left<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$h$" id="E1"><mml:mi>h</mml:mi></mml:math>-ideals in hemirings with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$t$" id="E2"><mml:mi>t</mml:mi></mml:math>-norms
International journal of mathematics and mathematical sciences