Full Idea
Are there perhaps modes of inference peculiar to mathematics which …do not belong to logic? Here one may point to inference by mathematical induction from n to n+1.
Gist of Idea
Does some mathematical reasoning (such as mathematical induction) not belong to logic?
Source
Gottlob Frege (Logic in Mathematics [1914], p.203)
Book Reference
Frege,Gottlob: 'Posthumous Writings', ed/tr. Hermes/Long/White etc [Blackwell 1979], p.203
A Reaction
He replies that it looks as if induction can be reduced to general laws, and those can be reduced to logic.