While reading Quine's Two Dogmas of Empiricism I was struck by the importance of analyticity. In philosophy, there are many arguments that are deeply challenging to evaluate. Take for example this argument from Kant for finitism:
If we assume that the world has no beginning in time, then up to every given moment an eternity has elapsed, and there has passed away in that world an infinite series of successive states of things. Now the infinity of a series consists in the fact that it can never be completed through successive synthesis. It thus follows that it is impossible for an infinite world-series to have passed away, and that a beginning of the world is therefore a necessary condition of the world's existence.
Is this a good argument? Like many abstract philosophy arguments, it's actually very difficult to tell. But if we had a method for determining which statements are analytic and which are synthetic, we'd have a better idea of whether to consider it serious or to dismiss it out of hand.
I won't be providing a method of distinguishing analytic from synthetic today. I don't know how to do that. However, I believe I have one puzzle piece.
Quine states that is it unclear whether statements like, "Anything green is extended" are analytic even though he know perfectly well what "green" and "extended" mean.
I would actually dispute this - the definitions of either of these words aren't clear at all. Take for example green - are we talking about what color we perceive or a wavelength that is emitted? What if we discovered tomorrow that vision didn't actually utilise light, but tiny particles? Would green be defined in terms of then? What about a green hallucination? Does that count as a "thing" that is green?
And what counts as extended? If we discovered we were characters in the matrix, would we count the virtual space we move around as extended? Would the real space count as extended? Arguably, we could say that space refers to an underlying structure that plays a particular role in our experiences and that since we are experiencing the virtual and not the "real" world when we talk about "extension" we mean extension in this virtual world.
Another way to think about this is in terms of import statements. Like in order to define green we may have to import the concept of light which then requires us to import the concepts of time and space.
Of course, these definitions are arbitrary so it is up to humans to choose how we use these words. Perhaps we want to follow Quine and say that if the world was different we'd probably define some of these words differently (ie. if we define water by chemical symbol and it were actually HO instead of H2O, then we'd change the definition). Or perhaps we want to say that words like object come attached with background assumptions such as "green" being limited in application to "objects" which are defined to be things with a spatial component. In any case, it seems to all be dependent on the definitions we utilise. And even though I can't tell you what analyticity mean conceptually, once we've provided sufficient clarification on what is being asked, we should be able to determine this practically.