In the diagram it shows that people can die from other causes at a rate $m$, however in the equations the $m$ and the variable $M_a$ disappear. Is there a mathematical reason for this to happen?
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2Equations (1)-(2)-(3) describe a restricted version of the model, when $m=0$. This might be explained on the previous page. – Did May 03 '16 at 18:10
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Thanks, I didn't realize that – Dalia Camacho García Formentí May 03 '16 at 18:23