I've been wondering about this for a while and I figure it would make an interesting, hopefully non-DISMISS CfJ.
I'm very convinced that nomic is entirely a perspectivist, subjective game, but let's see how that holds up to Judgement. I submit the following CfJ: "Facts (for example, 2 + 2 = 4), for the purposes of Agoran play, rely on some function of the collective Agoran opinion and not necessarily some objective reality. For example, if enough Agorans believe that 2 + 2 = 5 is true, it is then so for Agora."