All truths are identical: Yablo says: ‘ mathematicians know a lot of truths; metaphysicians know a lot of others. These truths are identical if we go by truth-conditions , since they are true in the same cases: all of them.’ Truth conditions flatten out difference. They are insensitive. Hempels ‘All crows are black’ has the equivalent truth conditions of ‘All non-black things are non-crows.’ But it strikes us as wrong to say they have identical meanings. Aboutness nails the difference, suggests Yablo. ‘One is about crows, the other not.’ We should care about this aboutness feature because it is simply interesting, even if there was nothing else. But there is.
Richard Marshall reviews Stephen Yablo’s Aboutness.