[mcartyem]

The truth based on criteria for truth. Irrefutable truths exist, like 1 + 1 = 2.

[Clotho]

Except when 1 + 1 = 10

[michael_fine]

Yes, but the first one is still universal, just it's assumed that we are talking about base 10.

[dgunn]

In base 10, 1+1 is still equal to 10 for very large values of 1.