Die Grundlagen der Arithmetik, §§82-3by George Boolos; Richard G. Heck,;The Finite and the Infinite in Frege's Grundgesetze der Arithmetikby Richard G. Heck,;On the Harmless Impredicativity of N=('Hume's Principle')by Crispin Wright;Neo-Fregeans: In Bad Company?by Michael Dummett;Response to Dummettby Crispin Wright