Eric Lengyel
@ericlengyel.bsky.social
• Creator of Radical Pie equation editor, Slug Library, C4 Engine
• Math / gamedev author
• Geometric algebra researcher
• Former Naughty Dog, Apple, Sierra
• Math / gamedev author
• Geometric algebra researcher
• Former Naughty Dog, Apple, Sierra
I’m in Washington DC for the Joint Mathematics Meetings. The exhibits open tomorrow, and Radical Pie is right up front.
January 3, 2026 at 8:03 PM
I’m in Washington DC for the Joint Mathematics Meetings. The exhibits open tomorrow, and Radical Pie is right up front.
Tomorrow, I leave for Washington DC where I'll be showing the brand new Radical Pie equation editor at the Joint Mathematics Meetings conference. If you're attending, come check it out at booth #505. I'm also going to have plenty of materials about projective geometric algebra.
January 1, 2026 at 11:26 AM
Tomorrow, I leave for Washington DC where I'll be showing the brand new Radical Pie equation editor at the Joint Mathematics Meetings conference. If you're attending, come check it out at booth #505. I'm also going to have plenty of materials about projective geometric algebra.
Version 1.2 of the Radical Pie equation editor has been released. This version contains some new features and a couple minor bug fixes. This is a free upgrade for all users.
radicalpie.com
radicalpie.com
January 1, 2026 at 1:23 AM
Version 1.2 of the Radical Pie equation editor has been released. This version contains some new features and a couple minor bug fixes. This is a free upgrade for all users.
radicalpie.com
radicalpie.com
Slug version 7.5 has been released. This update includes several small feature improvements.
sluglibrary.com
sluglibrary.com
December 31, 2025 at 7:31 AM
Slug version 7.5 has been released. This update includes several small feature improvements.
sluglibrary.com
sluglibrary.com
Reposted by Eric Lengyel
The MathPad 1A mini keyboard from @summacogni.bsky.social works spectacularly for #emacs org-mode, LaTeX in Markdown and surprisingly also with the #radicalpie equation editor from @ericlengyel.bsky.social out of the box
I'd maybe change the sub & super-script indices that insert unicode not boxes.
I'd maybe change the sub & super-script indices that insert unicode not boxes.
December 20, 2025 at 3:48 AM
The MathPad 1A mini keyboard from @summacogni.bsky.social works spectacularly for #emacs org-mode, LaTeX in Markdown and surprisingly also with the #radicalpie equation editor from @ericlengyel.bsky.social out of the box
I'd maybe change the sub & super-script indices that insert unicode not boxes.
I'd maybe change the sub & super-script indices that insert unicode not boxes.
For the upcoming JMM conference, I've got FGED1, FGED2, PGA Illuminated, the OpenGEX specification, my Master's Thesis, Dissertation, and a bunch of papers all remastered with Radical Pie for a total of 13,157 equations. I'd say it's sufficiently tested.
December 17, 2025 at 6:41 AM
For the upcoming JMM conference, I've got FGED1, FGED2, PGA Illuminated, the OpenGEX specification, my Master's Thesis, Dissertation, and a bunch of papers all remastered with Radical Pie for a total of 13,157 equations. I'd say it's sufficiently tested.
I built a new shipping crate in my garage that I'll be using to send stuff to trade shows. It's on its way to Washington DC now for the Joint Mathematics Meetings in early January, where I'm introducing the Radical Pie equation editor.
December 14, 2025 at 11:50 PM
I built a new shipping crate in my garage that I'll be using to send stuff to trade shows. It's on its way to Washington DC now for the Joint Mathematics Meetings in early January, where I'm introducing the Radical Pie equation editor.
Reposted by Eric Lengyel
December 13, 2025 at 4:59 AM
Radical Pie is the official lanyard sponsor of the Joint Mathematics Meetings 2026. This is the largest mathematics conference in the U.S. and a perfect place for the Radical Pie equation editor to make its academic debut.
December 8, 2025 at 8:36 PM
Radical Pie is the official lanyard sponsor of the Joint Mathematics Meetings 2026. This is the largest mathematics conference in the U.S. and a perfect place for the Radical Pie equation editor to make its academic debut.
Visual Studio 2026 has a new "Generate preprocessed output for any C++ file" feature that brings us one step closer to parity with the development functionality available in 1995 with CodeWarrior.
November 21, 2025 at 7:16 AM
Visual Studio 2026 has a new "Generate preprocessed output for any C++ file" feature that brings us one step closer to parity with the development functionality available in 1995 with CodeWarrior.
Version 1.1 of the Radical Pie equation editor has been released. This is a free upgrade for all users.
radicalpie.com
radicalpie.com
November 20, 2025 at 2:17 AM
Version 1.1 of the Radical Pie equation editor has been released. This is a free upgrade for all users.
radicalpie.com
radicalpie.com
Projective Geometric Algebra Illuminated has also been remastered with the Radical Pie equation editor in both the soft and hard cover formats. The content is the same, but all 4919 equations appearing in the text plus every equation in every figure has been upgraded with RP.
November 18, 2025 at 10:57 PM
Projective Geometric Algebra Illuminated has also been remastered with the Radical Pie equation editor in both the soft and hard cover formats. The content is the same, but all 4919 equations appearing in the text plus every equation in every figure has been upgraded with RP.
FGED 1&2 have been remastered with the Radical Pie equation editor, and the new versions are now available on Amazon (links below). The content is exactly the same, but the mathematical typesetting got an upgrade. The remaster applies to the soft cover versions only.
November 18, 2025 at 10:47 PM
FGED 1&2 have been remastered with the Radical Pie equation editor, and the new versions are now available on Amazon (links below). The content is exactly the same, but the mathematical typesetting got an upgrade. The remaster applies to the soft cover versions only.
Writing documentation and watching game 7 of the World Series tonight.
November 2, 2025 at 2:07 AM
Writing documentation and watching game 7 of the World Series tonight.
New blog post about the development of Radical Pie:
terathon.com/blog/radical...
terathon.com/blog/radical...
November 1, 2025 at 10:32 PM
New blog post about the development of Radical Pie:
terathon.com/blog/radical...
terathon.com/blog/radical...
About two months from now, I'll be showing Radical Pie at the Joint Mathematics Meetings in Washington, D.C. I already have the best booth location on the exhibit floor.
jointmathematicsmeetings.org/jmm
jointmathematicsmeetings.org/jmm
October 29, 2025 at 10:38 PM
About two months from now, I'll be showing Radical Pie at the Joint Mathematics Meetings in Washington, D.C. I already have the best booth location on the exhibit floor.
jointmathematicsmeetings.org/jmm
jointmathematicsmeetings.org/jmm
With a couple quick color changes, Radical Pie runs in dark mode.
October 29, 2025 at 8:33 PM
With a couple quick color changes, Radical Pie runs in dark mode.
I am excited to announce the release of Radical Pie, version 1.0! This is the professional equation typesetting application that I've been working on for the last year. See the website for details.
radicalpie.com
radicalpie.com
October 28, 2025 at 10:39 PM
I am excited to announce the release of Radical Pie, version 1.0! This is the professional equation typesetting application that I've been working on for the last year. See the website for details.
radicalpie.com
radicalpie.com
Radical Pie has a gazillion typesetting parameters that you can fine-tune to your heart's content. Here's all the stuff you can tweak for parentheses, brackets, braces, etc.
October 24, 2025 at 3:53 AM
Radical Pie has a gazillion typesetting parameters that you can fine-tune to your heart's content. Here's all the stuff you can tweak for parentheses, brackets, braces, etc.