Full Idea
The main criticism that deflationist theories based on the disquotation sentences or similar axioms have to meet was raised by Tarski: the disquotation sentences do not allow one to prove generalisations.
Gist of Idea
The main problem for deflationists is they can express generalisations, but not prove them
Source
Volker Halbach (Axiomatic Theories of Truth [2011], 7)
Book Reference
Halbach,Volker: 'Axiomatic Theories of Truth' [CUP 2011], p.61
Related Idea
Idea 16316 Deflationists say truth is just for expressing infinite conjunctions or generalisations [Halbach]