Euclid distinguishes the unit (VII, Def.1) and number -- a multitude composed of units -- (VII, Def.2). His definition of prime and composite numbers (VII, Def.11 and Def.13) clearly exclude one from the group of numbers, otherwise every number would be composite.
I think this is good to argue that my assertion is likely too strong. I fear this is close to arguing that early programmers were not familiar with map/flatMap. They did not discuss it as a first class thing, sure. Was it completely alien to all practitioners? I find that harder to swallow and it is likely that we are debating methods versus functions completely removed from the context in which the words were largely used.
