 A sentence’s 1-intension is an intension that corresponds to the diagonal of a 2D matrix. So the Core Thesis affirms that a token sentence is apriori (for a subject at a particular time) just in case there is no possible way the world might be that, if it actually obtained, would make S false. In effect, the Core Thesis sums up the “golden triangle” of constitutive connections the rationalist hopes to establish between meaning, apriority, and possibility: (i) it postulates a possible way the world could be for every apriori coherent hypothesis, and vice versa; and (ii) this tight connection between apriority and possibility is reflected in an aspect of linguistic meaning, the  1-intension.[16]