Numbers are the raw material for developments in mathematics. Every revolution in mathematics is associated with new numbers, that is, with new measurements such as symbolic algebra ~ discovery of negative numbersHamilton algebra ~ quaternions- measurement of rotations in spaceGrassmann algebra ~ hypercomplex numberscalculus ~ differentials -measurement of infinitesimal quantities Cantor sets ~ tranfinite numbers-measure infinity irrational numbers~ the real numbers continuum ...hyperreal numbers of Robinson differentials etc.