h(miseia moi=ra/ e)sti to\ e(\n toi=n duoi=n.I think this sentence means 'one (part) divided by two is a half part.
But what does toi=n mean.
And what is the form duoi=n.
Edit. I figured it out: toi=n and duoi=n.
Dual Genitive of the article and of du/o.