> [...]
The idea that defining a thing actually defines two things seems self evident [once you notice it].
At least one case of unavoidable definition also seems self evident [once you notice it].
The problem with evidence is that on one side there is no other known basis to build certainties and on the other it appears to be very relative [once you notice it]. :-)
Also, (self) evidence that seems so sounds like a pleonasm to me.
Georges.
