blue flame This little image is a closeup of the top of one of the Arnold Tongues (phase locked regions occurring at frequencies that are Farey numbers), specifically, the one that appears on the iterated circle map. There are many more pictures in my Art Gallery.


Contacting Me

I'm flooded with spam email which I am no longer able to control. I no longer accept email at linas@linas.org. Sorry. If you need to reach me, leave a note for me at google+ or on my talk page at Wikipedia. Since I check these only intermittently, or rather, just plain infrequently, urgent requests should be made by phone.

Or send me a postcard. I like postcards!


The Home Page of Linas VEPSTAS

Welcome to my home page! There's a lot of stuff here, some quite good, and some that's so bad I'm ashamed of it. Yet I've been too busy to find it, figure out if it really is that bad, and remove it. So its a grab bag. Some of it's funny but mostly it's not. A lot of stuff here is hopelessly dated. I tend to spend most of my on-line social time on the opencog blog, freenode.net/gimp.net irc, maling lists, wikipedia, and google+, rather than in polishing this web site. Basically, this page is a snapshot frozen in time: its what a blog looked like before blogs were invented.

Who am I?

At various times in my life, I've been a scientist, technologist and entrepreneur. I have broad interests in mathematics, physics, and computer technology.

My current technical interests focus on natural language processing and artificial general intelligence. I've held jobs working in the above areas; unfortunately, I now pursue these only as a hobby. The NLP directory has pre/re-prints of some of the academic publications that have come out of this work. My primary research platform is the open-source OpenCog project. For me, OpenCog provides a general technical setting where I can experiment with different machine learning theories and algorithms, with both connectionist and symbolic processing flavors. I've compiled a messy list of related open-source AGI projects here.

I've spent many years at IBM; most recently working on the Linux kernel for Power architecture-based mainframes. The Linux on the PowerPC wiki is a good place to find out more about IBM Linux mainframes and systems. I've been active in the Linux community; I was a founder of the Gnome Foundation; and was the lead developer for GnuCash for over 7 years. I've founded three dot-com startups, all of which failed to enrich me financially. I was a founding member of the OpenGL Architecture Review Board; and spent 8 years learning about and designing 3D graphics hardware and software. I have a PhD in theoretical physics from SUNY at Stony Brook. Currently, I am utterly infatuated with mathematics, and have made large contributions to over 400 math articles in Wikipedia. BTW, y'all, global warming is for real. Do something about it.


Linas' Mathematical Art Gallery
A colorful exploration of some well-known, but under-examined equations. I think some of this is high Art, and much of the rest of it should be an eye-opener for even jaded fractal mathematicians.

The Art Gallery has been running for fifteen or twenty years while being silent about the underlying math. I suppose its high time to make amends. The core idea of the dissertation is that the shapes of fractals are describable through Farey Fractions, which appear naturally through continued fractions, which have the symmetry of the Modular Group SL(2,Z), which is inter-twined with the Riemann Zeta and the structure of the set of rational numbers. Besides the four basic operations on the real numbers (addition, subtraction, multiplication, division), there is a fifth basic operation which is rarely taught in primary school and under-appreciated at higher levels, namely, "Farey Addition" or, expressed correctly, group multiplication in SL(2,Z). The modular group doesn't just lead to Pellian equations and algebraic numbers, it in fact intertwines all rational numbers (and their extensions to reals and p-adics) in crazy, fractal ways. This is why, for example, one sees Farey Fractions in the Mandelbrot Set. In number theory, the structure of the Modular Group provides a unifying theme for understanding the nature of factorization and primality. This is why, for example, power series and Dirichlet series (such as the Riemann Zeta) exhibit such crazy fractal Cantor-Set type patterns. Despite this connection being seen by Weierstrass as early as 1872, its more-or-less entirely ignored in standard textbooks on Analysis and Number Theory. A series of articles tries to provide some of the underpinnings for the above breathless assertions. Some highlights include:

Political, Economic and Social Screeds
Some short essays on emerging economic and political forces. Most of these are just sly, corrsive expressions of anger and hostility, a lashing out at events beyond my control. Kind of like those ugly tv/radio talk shows, just not from the wacko right-wing nut-job perspective.

Linux Enterprise Computing
(Old, out of date) References, resources and a guide to prominent Free Software systems and technologies, from the corporate computing perspective. This is a snapshot of what Linux tech was like back in the late 1990's. Topics include:

My Free Software Projects
I've worked on many free software projects. Below are some of my favorites, with a more complete list here. My Ohloh account provides details and statistics for some of my more recent, active projects.

Technical Ruminations
Miscellaneous technical articles and notes.

Philosophical Ruminations
Sophomoric, half-baked, incoherent, nutty ideas, most of which have probably already been better-expressed in some top-ten selling book. These include, but are not limited to:

My Weblog
This is the output of my new experimental note-taking and publishing and general-diary tool, GnoTime. We'll see how easy, scalable, effective this tool really is. Or, how dis-interested I am in using it ...

The good stuff is in the form of letters:

Employment History, Schooling
References pertaining to the various jobs I've held, and what I did while I worked there. In reverse chronological order. My sort-of current resume is here.

Web Site Mirrors and More Web Site Mirrors
A random assortment of mirrored web sites. I mirrored these because at some point in time I thought their content was interesting, and they seemed to be at risk of disappearing forever... and some of them have ... This is my attempt to archive some of these, for some distant future rainy day.

Vintage Netscape Navigator
Some vintage copies of Netscape Navigator, v1.0n, v1.1 beta 1 and v2.0, for Linux/x86. These are circa 1994-1995. The binaries still run on my machine.

Rowing
A really great photo of me at the 2009 Pumpkinhead 5K head race (7:45AM 31 October 2009). Peter Hoffmann in stroke, we're enroute to the starting line. During the race, we ran the boat aground (into a pollution control barrier), got completely hung up, lost a few minutes trying to get underway again, and still managed to win the race!

Training video, with coach's chase-boat in pursuit.

Lietuva
Taip, aš kalbu Lietuviškai. Parašykite!
Panevėžys
Taip, tevas iš Panevežio.
Veps
Dabarmėtiniais laikais gyvena apie 6000-12000 kalbėtoju kalbos 'Veps', ant Rusijos-Finlandijos sieno, Karelijoje. Man šove į galvą, ar gali būti, kad, sakykime, prieš 5-10 generacijiu, gal koks žmogus, o gal visa šeima ar giminyste, atvažiavo iš Karelijos, ir apsigyveno Lietuvoje? Nu, Karelija ne taip jau toli nuo Lietuvos. Jeigu taip tikrai iškylo ta keista pavarde 'Vepštas', tai tas primas 'Veps' negalėjo atkeliauti ilgiau negu prieš 10 generaciju (200 metu), nes Vepštai nepaplite po visa Lietuva; bet irgi ne greičiau negu 5 generacijas, nes yra šimtai Vepštu. Tai ... ar galėtu būti?

Finlandijoi randama pavarde 'Vepsalainen'. Dagiau apie Veps.

My Goddess Jewelry
Please buy some of this beautiful jewelry!

Started in 1995, last updated October 2010
linas@linas.org