EntityQ864145· pop 20· linked from 115 articlessplit-complex numberSign in to saveelement of the real commutative associative algebra ℝ[j] / (j² − 1), i.e. the reals with an extra square root of +1 adjoinedConnectionshyperbolic functionEntityquadratic formEntityMathematical ReviewsEntityBicomplex numberEntitynull vectorEntityJames CockleEntitydefinable real numberEntityArgentinaCountrynumberEntitygeometryEntityalgebraEntityareaEntityInternational Standard Book NumberEntitynatural numberEntitycomplex numberEntityintegerEntityinfinityEntityadditionEntitymultiplicationEntityreal numberEntityCategoriesComposition algebrasHypercomplex numbersLinear algebra