Commensurability
idea · 1 work · 3 mentions · 11 anchored passages
commensurable · commensurable in length · incommensurable · commensurable in square · commensurable in square only
in the texts
Elements
The relation between magnitudes that share a common measure (in length or in square), central to Book X's classification of rational and irrational lines.
1] therefore ED is commensurable in length with DF.
But ED is rational and incommensurable in length with DC;
Therefore CD, DF are rational and commensurable in square only.