Split-complex number

In abstract algebra, a split complex number (or hyperbolic number, also perplex number, double number) has two real number components x and y, and is written z = x + y j, where j2 = 1. The conjugate of z is z∗ = x − y j. Since j2 = 1, the product of a number z with its conjugate is zz∗ = x2 − y2, an isotropic quadratic form, N(z) = x2 − y2. A similar algebra based on R2 and component-wise operations of addition and multiplication, (R2, +, ×, xy), where xy is the quadratic form on R2, also forms a quadratic space. The ring isomorphism

Split-complex number

In abstract algebra, a split complex number (or hyperbolic number, also perplex number, double number) has two real number components x and y, and is written z = x + y j, where j2 = 1. The conjugate of z is z∗ = x − y j. Since j2 = 1, the product of a number z with its conjugate is zz∗ = x2 − y2, an isotropic quadratic form, N(z) = x2 − y2. A similar algebra based on R2 and component-wise operations of addition and multiplication, (R2, +, ×, xy), where xy is the quadratic form on R2, also forms a quadratic space. The ring isomorphism