Homotopic Chain Maps Have Equal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:math>-Homology and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M2"><mml:mrow><mml:mi>d</mml:mi></mml:mrow></mml:math>-Homology
International journal of mathematics and mathematical sciences