When understanding our use of sentences of the form All A s are B , we need to appreciate the presuppositions involved. Since our use of R1 and R2 normally involves different presuppositions it is only in artificially constructed formal languages that they are assimilated they are not equivalent, and the paradox is resolved. There is therefore no need to reject the principle of confirmation G1. The similarities between the two paradoxes are obvious. In both cases, G1, and either E1 or an analogue, are operative, together with two generalisations of the form All A s are B and a purported instance of each generalisation.
All emeralds are grue.
It is blue and has not been examined. This emerald is green. This emerald is grue. If two statements can be known a priori to be equivalent, then any generalisation that is confirmed by one is confirmed by the other. By G1, B1 confirms A1 and B2 confirms A2.