 The contributions of Gottlob Frege (1848–1925) to logic from the period 1879–1903, based on an axiomatic approach to logic, had very little influence at the time (and the same can be said of the diagrammatic systems of C.S. Peirce developed at the turn of the century). Whitehead and Russell rejected the algebra of logic approach, with its predominantly equational formulations and algebraic symbolism, in favor of an approach strongly inspired by the axiomatic system of Frege, and using the notation developed by Giuseppe Peano, namely to use logical connectives, relation symbols and quantifiers.