<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi>𝒩</mml:mi></mml:mrow></mml:math>-Subalgebras in BCK/BCI-Algebras Based on Point<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mml:mrow><mml:mi>𝒩</mml:mi></mml:mrow></mml:math>-Structures
International journal of mathematics and mathematical sciences