#### Welcome to “A Three Dimensional Coordinate System for Complex Numbers”.

A 3D function has three variables. Each variable is graphed on one of the three space axes. The functions have one input variable *x* and two output variables *y + iz* and are of the form:

*y + iz = f(x)*

The input variable, *x,* is graphed on the horizontal axis. The real part of the output variable, *y,* is graphed on the vertical axis and the imaginary part of the output variable, *iz,* is graphed on the depth axis.

For example: the standard equation of the hyperbola:

with:

And rearranged gives the two functions:

with the positive root function in black and the negative root function in red, in three dimensions, this would look like:

Bringing our attention to the area between the vertices, notice that input values:

will generate imaginary numbers and these are not normally allowed as part of the graph. When x is in this part of the domain the functions actually generate *complex* numbers whose real part is zero. Now that we have a definition for these output imaginary values as being along the depth axis, we can include the domain of *x *which generates them and graph the two functions as follows. Positive root in black, negative root in red.

An imaginary circle, in the third dimension, appears between the vertices!

(The graphing software has a little trouble at certain vertex points.)

The new coordinate system is called “3Di”, an acronym for Third Dimension Imaginary which makes *everything* simpler. The above example and many others are included in the following basic introductory article:

#### A New Geometry of *i*

*i*

**part 1: Elementary Algebraic Functions in 3Di Coordinates**

#### Abstract

Imaginary numbers are discussed in relation to human experience and a new coordinate system, “3Di” – an acronym for “Third Dimension Imaginary” is introduced and defined. A three dimensional function of the form: [*y + iz = f(x)*] is then defined. Polynomials, conics, elliptic curves and hyperelliptic curves are graphed in these coordinates and shown to exist in three dimensions by way of a new and simple *geometric* definition of an imaginary number. This definition becomes intuitively obvious and therefore provides a potentially high school level of understanding of complex numbers. Thus, the new coordinate system itself potentially facilitates a grand enhancement to mathematics education. The two dimensional functions become three dimensional functions with the notion of a ‘bifurcation point’. Usually occurring at vertexes, cusps and turning points, a bifurcation point is where multiple branches, both real and imaginary, of the various algebraic functions meet and make various types of turns onto orthogonal planes.

#### Euler’s Formula

Historically and currently Euler’s formula:

enjoys wide agreement as to its *algebraic* interpretation and meaning. In this six-part blog we present its many and varied new *geometric *interpretations and meanings made possible with “3Di” coordinates.

In blog #1 Euler’s formula is used as a rotation of the exponential graph through an imaginary circle.

In blog #2 Euler’s formula is used as an ‘orbit operator’.

In #3 as a helix with both fixed three-dimensional geometry, and in four dimensions with an animation variable.

In #4 we show that Euler’s identity actually maps a point on an ‘exponential/natural log surface’!

In #5 a ‘circular helicoid standing wave’ is shown in which Euler’s imaginary exponential is used no less than five times in the equation: as a surface operator, an orbit operator, a synchronizing rotator, a spin coefficient, and as a reciprocal spin coefficient!

In #6 we present the equation that updates Euler’s formula for all bases: positive, negative, real, imaginary and complex.

“3Di Coordinates” is a completely new concept that makes everything easier to understand. The eBook contains nearly six hundred line and surface graphs illustrating the equations so you can settle in for an enjoyable as well as informative experience. Thanks!

Sincerely,

greg ehmka

Greg Ehmka’s math e-book demonstrates the real potential of this publishing medium; an active table of contents, an active list of animations, and active cross-referencing make browsing quick and studying delightful. There are also links to external sites that provide instant access to relevant sources. Adding enjoyment and inspiration are over eighty brief videos that animate many of the ground-breaking math equations to colorfully express their resulting objects. This doesn’t begin to speak of the mind-blowing content, which you will just need to see for yourself! Ehmka mingles whimsy with his genius rendering this work both astoundingly brilliant and accessible.

- M.C.W., editor