Solutions of the neutral differential-difference equation<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$\alpha x'\left( t \right) + \beta x'\left( {t - r} \right) + \gamma x\left( t \right) + \delta x\left( {t - r} \right) = f\left( t \right)$"><mml:mrow><mml:mi>α</mml:mi><mml:msup><mml:mi>x</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:mrow><mml:mo>(</mml:mo><mml:mi>t</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mo>+</mml:mo><mml:mi>β</mml:mi><mml:msup><mml:mi>x</mml:mi><mml:mo…
International journal of mathematics and mathematical sciences