The symbolic language created by Peano plays a very grand rôle in these new researches.
This method is due partly to Peano, partly to another Italian named Fano.
All these, however, are a concession, and are swept away by Professor Peano.
Dedekind and Peano have worked out such ordinal theories of the number concept.
M. Couturat begins by stating Peano's five assumptions, which are independent, as has been proved by Peano and Padoa.
Two hundred years ago, Leibniz foresaw the science which Peano has perfected, and endeavoured to create it.