Radical Pie

Professional Equation Editor

Coming Soon

Radical Pie is a professional equation editing application for Windows 10/11 currently in development by Eric Lengyel. A beta test is planned for summer 2025, and the final release is expected shortly after that.

Relativistic Quaternions

Purpose

The goal of Radical Pie is to produce mathematical typography of the highest possible quality. It’s suitable for use in the most demanding technical documents ranging from conference papers to large textbooks. It’s also designed to be a perfect solution for putting equations in slide presentations and YouTube videos.

Radical Pie is not a word processor. It just handles the math. It’s seamlessly integrated with Microsoft Word, and it produces vector output that can be used in most other applications that support vector graphics. We have gone to great lengths to ensure compatibility when equations are transferred to different applications and moved to different computers. For instance, all glyphs appearing in an equation are outlined so it’s not necessary to have the original fonts installed. We also avoid using strokes in SVG output so that every equation is ultimately composed only of filled paths. This works around known bugs in other applications that don’t always get everything right when vector images are embedded in a document that’s converted to a PDF.

To the right is an example of a short math-heavy paper entitled Relativistic Quaternions written in Microsoft Word with Radical Pie.

Features

This is a short list of the major features. There are many details and fine points of mathematical typesetting not mentioned here.

If you’re a fan of the classic versions of MathType, then you’ll feel right at home in Radical Pie. Except now, you’ll have access to the next generation of equation editing features, and you’ll get superior results across the board.

Licensing Model

Radical Pie will be sold under traditional software licensing terms. You purchase it once, and the version you bought works forever. No subscriptions. No signing in. No connecting to a server on the internet.

Stay Informed

Additional information and screenshots will be posted as the final release nears. Join the Discord server if you’d like to ask questions. Follow Eric’s posts for the latest development news.

Examples

Here are a few examples of equations created in Radical Pie with added drawings and annotations. These are actual SVG files generated directly by Radical Pie. They contain embedded equation data, so it’s possible to open them in Radical Pie and continue editing.

This is the rendering equation used in 3D graphics. Drawing objects like the green highlighting and various arrows are attached to anchor points in the equation. This means that when the equation is edited and the anchor points move, and the objects you’ve drawn dynamically adjust to the proper size and position in relation to the parts of the equation you originally attached them to.

The rendering equation with annotations

The following is the formula for a general circle in 3D conformal geometric algebra. The colored text appearing in this example and the previous example are called annotations, and these can be attached to anchor points on drawing objects. Each annotation can be something simple like a text label or an arbitrarily complex mathematical expression.

Circle in 3D conformal geometric algebra

This is a 16 × 16 matrix representing the extended metric in 3D projective exterior algebra. Radical Pie has a special function that populates a matrix using the contents of one cell as a template, so it was not necessary to manually type in all 256 entries. The colored boxes and lines were attached to anchor points inside the matrix.

Extended metric in 3D projective exterior algebra