February 27, 2012 by Chris on Tidbits

Lovely bonsai & sculpture http…

Lovely bonsai & sculpture http://t.co/viwXDhNU more on Flickr http://t.co/K9cIz5ED

February 27, 2012 by Chris on Tidbits

I just liked “The City of Samb…

I just liked “The City of Samba” on Vimeo: http://t.co/4h9IAWcD

February 27, 2012 by Chris on Tidbits

Be careful what you link to on facebook, you may become a reluctant spokesman for just the wrong product. http://t.co/S1CSpkVd via @kottke

February 23, 2012 by Chris on Tidbits

Rupaul holding Kurt Cobain’s daughter with Dave Grohl: http://t.co/kNEOiuC1 … were they really this bad?

February 22, 2012 by Chris on Tidbits

First sleep and second sleep. Are our bodies tuned to a different way to sleep? http://t.co/f4IwIvJF

These are my links for July 20th through July 24th:

Ask HN: Best-architected open-source business applications worth studying? | Hacker News -
Monospaced Programming Fonts with Ligatures | Hacker News -
The language of choice - Propositional logic was discovered by Stoics around 300 B.C., only to be abandoned in later antiquity and rebuilt in the 19th century by George Boole’s successors. One of them, Charles Peirce, saw its significance for what we now call logic circuits, yet that discovery too was forgotten until the 1930s. In the ’50s John McCarthy invented conditional expressions, casting the logic into the form we’ll study here; then in 1986 Randal Bryant repeated one of McCarthy’s constructions with a crucial tweak that made his report “for many years the most cited paper in all of computer science, because it revolutionized the data structures used to represent Boolean functions” (Knuth).1 Let’s explore and code up some of this heritage of millennia, and bring it to bear on a suitable challenge: playing tic-tac-toe.
Then we’ll tackle a task that’s a little more practical: verifying a carry-lookahead adder circuit. Supposedly logic gets used all the time for all kinds of serious work, but for such you’ll have to consult the serious authors; what I can say myself, from working out the code to follow, is that the subject offers a fun playground plus the most primitive form of the pun between meaning and mechanism.

You’re encouraged to read with this article’s code cloned and ready