August 1, 2011 by Chris on Tidbits

Just uploaded 20 new photos to…

Just uploaded 20 new photos to my PicasaWeb “2011 Cothrun family camping” album: http://bit.ly/pegHl1

August 1, 2011 by Chris on Tidbits

Just uploaded 8 new photos to …

Just uploaded 8 new photos to my PicasaWeb “2011 Cothrun family camping” album: http://bit.ly/pegHl1

August 1, 2011 by Chris on Tidbits

The Humble Indie Bundle 3, even more awesome games I don’t have time to play (I already own some of these) http://t.co/jk1GtvW via @humble

July 30, 2011 by Chris on Tidbits

#hydrocarbon usage to keep fire burning attracted attention of the campground host, subdued camping ensues.

July 28, 2011 by Chris on Tidbits

Camping with family instead of attending the #khan Good times instead of good times.

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