the integer value ’1′ is a physical constant in itself

it is the first physical constant (or something like it) as it is the constant of existence.

there is 1 existence.

whatever exists as a discrete part of existence, there is 1 of it

if many of the ‘same’ thing exist – while they share properties, they have discrete locations – only 1 exists in each different location

(it could be said they share all properties, except location)

and where more than 1 of the same ‘things’ exist, we can say – and demonstrate – 1+1=2 is a fundamental law of nature