utm = Urchin Tracking Module
How is mathematics made? What sort of brain is it that can compose the propositions and systems of mathematics? How do the mental processes of the geometer or algebraist compare with those of the musician, the poet, the painter, the chess player? In mathematical creation which are the key elements? Intuition? An exquisite sense of space and time? The precision of a calculating machine? A powerful memory? Formidable skill in following complex logical sequences? A supreme capacity for concentration?
The essay below, delivered in the first years of this century as a lecture before the Psychological Society in Paris, is the most celebrated of the attempts to describe what goes on in the mathematician's brain. Its author, Henri Poincaré, cousin of Raymond, the politician, was peculiarly fitted to undertake the task. One of the foremost mathematicians of all time, unrivaled as an analyst and mathematical physicist, Poincaré was known also as a brilliantly lucid expositor of the philosophy
USERNAME [a-zA-Z0-9._-]+ | |
USER %{USERNAME} | |
INT (?:[+-]?(?:[0-9]+)) | |
BASE10NUM (?<![0-9.+-])(?>[+-]?(?:(?:[0-9]+(?:\.[0-9]+)?)|(?:\.[0-9]+))) | |
NUMBER (?:%{BASE10NUM}) | |
BASE16NUM (?<![0-9A-Fa-f])(?:[+-]?(?:0x)?(?:[0-9A-Fa-f]+)) | |
BASE16FLOAT \b(?<![0-9A-Fa-f.])(?:[+-]?(?:0x)?(?:(?:[0-9A-Fa-f]+(?:\.[0-9A-Fa-f]*)?)|(?:\.[0-9A-Fa-f]+)))\b | |
POSINT \b(?:[1-9][0-9]*)\b | |
NONNEGINT \b(?:[0-9]+)\b |
USERNAME [a-zA-Z0-9._-]+ | |
USER %{USERNAME} | |
INT (?:[+-]?(?:[0-9]+)) | |
BASE10NUM (?<![0-9.+-])(?>[+-]?(?:(?:[0-9]+(?:\.[0-9]+)?)|(?:\.[0-9]+))) | |
NUMBER (?:%{BASE10NUM}) | |
BASE16NUM (?<![0-9A-Fa-f])(?:[+-]?(?:0x)?(?:[0-9A-Fa-f]+)) | |
BASE16FLOAT \b(?<![0-9A-Fa-f.])(?:[+-]?(?:0x)?(?:(?:[0-9A-Fa-f]+(?:\.[0-9A-Fa-f]*)?)|(?:\.[0-9A-Fa-f]+)))\b | |
POSINT \b(?:[1-9][0-9]*)\b | |
NONNEGINT \b(?:[0-9]+)\b |
- proxy server
- agent configuration - install software on the web server
The following steps occur when a user tries to access a protected resource on a web server configured to use SiteMinder authentication:
L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns
Compress 1K bytes with Zippy ............. 3,000 ns = 3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns = 20 µs
SSD random read ........................ 150,000 ns = 150 µs
Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs
compdef
complete
compctl
// Use Gists to store code you would like to remember later on | |
console.log(window); // log the "window" object to the console |
-
write config file make a config.admin.js, config couchAuth for couch login, and registryCouch to couchdb; update =npm= change the registry address;
-
start redis install redis, run:
redis-server dev/redis/redis.conf
-
start elasticsearch install elasticsearch, run:
var pool = mysql.createPool({ | |
host: '127.0.0.1', | |
port: '3306', | |
user: 'root', | |
password: '123456', | |
database: 'test', | |
debug: process.env.NODE_ENV == 'debug' | |
}); | |