| Andrew Cooke | Contents | Latest | RSS | Twitter | Previous | Next

C[omp]ute

Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

Last 100 entries

Ky - Restaurant Santiago; The Black Dork Lives!; The UN Requires Unaninmous Decisions; LPIR - Steganography in Practice; How I Am 6; Clear Explanation of Verizon / Level 3 / Netflix; Teenage Girls; Formalising NSA Attacks; Switching Brakes (Tektro Hydraulic); Naim NAP 100 (Power Amp); AKG 550 First Impressions; Facebook manipulates emotions (no really); Map Reduce "No Longer Used" At Google; Removing RAID metadata; New Bike (Good Bike Shop, Santiago Chile); Removing APE Tags in Linux; Compiling Python 3.0 With GCC 4.8; Maven is Amazing; Generating Docs from a GitHub Wiki; Modular Shelves; Bash Best Practices; Good Emergency Gasfiter (Santiago, Chile); Readings in Recent Architecture; Roger Casement; Integrated Information Theory (Or Not); Possibly undefined macro AC_ENABLE_SHARED; Update on Charges; Sunburst Visualisation; Spectral Embeddings (Distances -> Coordinates); Introduction to Causality; Filtering To Help Colour-Blindness; ASUS 1015E-DS02 Too; Ready Player One; Writing Clear, Fast Julia Code; List of LatAm Novels; Running (for women); Building a Jenkins Plugin and a Jar (for Command Line use); Headphone Test Recordings; Causal Consistency; The Quest for Randomness; Chat Wars; Real-life Financial Co Without ACID Database...; Flexible Muscle-Based Locomotion for Bipedal Creatures; SQL Performance Explained; The Little Manual of API Design; Multiple Word Sizes; CRC - Next Steps; FizzBuzz; Update on CRCs; Decent Links / Discussion Community; Automated Reasoning About LLVM Optimizations and Undefined Behavior; A Painless Guide To CRC Error Detection Algorithms; Tests in Julia; Dave Eggers: what's so funny about peace, love and Starship?; Cello - High Level C Programming; autoreconf needs tar; Will Self Goes To Heathrow; Top 5 BioInformatics Papers; Vasovagal Response; Good Food in Vina; Chilean Drug Criminals Use Subsitution Cipher; Adrenaline; Stiglitz on the Impact of Technology; Why Not; How I Am 5; Lenovo X240 OpenSuse 13.1; NSA and GCHQ - Psychological Trolls; Finite Fields in Julia (Defining Your Own Number Type); Julian Assange; Starting Qemu on OpenSuse; Noisy GAs/TMs; Venezuela; Reinstalling GRUB with EFI; Instructions For Disabling KDE Indexing; Evolving Speakers; Changing Salt Size in Simple Crypt 3.0.0; Logarithmic Map (Moved); More Info; Words Found in Voynich Manuscript; An Inventory Of 3D Space-Filling Curves; Foxes Using Magnetic Fields To Hunt; 5 Rounds RC5 No Rotation; JP Morgan and Madoff; Ori - Secure, Distributed File System; Physical Unclonable Functions (PUFs); Prejudice on Reddit; Recursion OK; Optimizing Julia Code; Cash Handouts in Brazil; Couple Nice Music Videos; It Also Works!; Adaptive Plaintext; It Works!; RC5 Without Rotation (2); 8 Years...; Attack Against Encrypted Linux Disks; Pushing Back On NSA At IETF; Summary of Experimental Ethics; Very Good Talk On Security, Snowden; Locusts are Grasshoppers!; Vagrant (OpenSuse and IDEs)

© 2006-2013 Andrew Cooke (site) / post authors (content).

More Constructivism

From: "andrew cooke" <andrew@...>

Date: Fri, 20 Jan 2006 12:03:14 -0300 (CLST)

This is related to the thread I had on AskMe -
http://ask.metafilter.com/mefi/29489

Since I've given up Mefi in disgust and sorrow, I thought I'd follow up
here with some links to related items on Wikipedia.

Curry-Howard correspondence (lots of interesting stuff here) -
http://en.wikipedia.org/wiki/Curry-Howard_correspondence - "the close
relationship between computer programs and mathematical proofs [...] There
are a number of ways to think about the Curry-Howard correspondence. In
one direction, it operates on the level compile proofs into programs. Here
proof was, originally, limited to proofs in constructive logic  typically
in a system of intuitionistic logic."

And another way to look at the excluded middle - Peirce's law -
http://en.wikipedia.org/wiki/Peirce's_law

Vaguely related - Heyting algebras -
http://en.wikipedia.org/wiki/Heyting_algebra - "... arise as models of
intuitionistic logic, a logic in which the law of excluded middle does not
in general hold"

Andrew

Type Theory and Functional Programming

From: "andrew cooke" <andrew@...>

Date: Fri, 20 Jan 2006 12:07:32 -0300 (CLST)

Related to the above

Free book - http://www.cs.kent.ac.uk/people/staff/sjt/TTFP/

Andrew

Djinn - Types to Functions

From: "andrew cooke" <andrew@...>

Date: Fri, 20 Jan 2006 17:59:48 -0300 (CLST)

Starting to read through the types book I realisd I didn't know what a
proposition was, which seemed kind of worrying.  Searching lambda turned
up this post from Shae - http://lambda-the-ultimate.org/node/view/1178

It doesn't answer my question, but it does blow my mind.

Andrew

Formalizing Constructive Mathematics

From: "andrew cooke" <andrew@...>

Date: Sat, 21 Jan 2006 09:46:33 -0300 (CLST)

This is a section of chapter 3 of TTFP, starting at p 64
(http://www.cs.kent.ac.uk/people/staff/sjt/TTFP/)

[...] [Bee85] http://www.amazon.com/gp/product/0387121730 provides a very
useful survey addressing [the many schools fomalizing constructive
mathematics] and we refer the reader to this for more detailed primary
references.  The text covers theories like Intuitionistic set theory
(IZF), Feferman's theories of operations and classes [Fef79]
http://www.amazon.com/gp/product/0444853782, as well as various formalized
theories of rules, all of which have been proposed as foundations for a
treatment of constructive mathematics.

One area which is overlooked in this study is the link between category
theory and logic, the topic of [LS86]
http://www.amazon.com/gp/product/0521356539.  This link has a number of
threads, including the relationship between the lambda calculus and
cartesian closed categories, and the category-theoretic models of
intuitionist type theory provided by toposes.  The interested reader will
want to follow the primary references in [LS86]

Comment on this post