Search results
Results from the WOW.Com Content Network
The remaining, more difficult part, is to prove that for there is no equivalent regular expression of star height less than n; a proof is given in Eggan (1963). However, Eggan's examples use a large alphabet, of size 2 n-1 for the language with star height n. He thus asked whether we can also find examples over binary alphabets.
A Pattern Language: Towns, Buildings, Construction is a 1977 book on architecture, urban design, and community livability.It was authored by Christopher Alexander, Sara Ishikawa and Murray Silverstein of the Center for Environmental Structure of Berkeley, California, with writing credits also to Max Jacobson, Ingrid Fiksdahl-King and Shlomo Angel.
NP-hardness of pattern language membership, by reduction from the NP-complete 1-in-3-SAT problem: Given a CNF of m clauses with n variables, a pattern of length 3n+4m+1 with 2n variables and a string of length 4n+5m+1 can be constructed as shown (m=3 and n=4 in the example). Upper-case variables in the pattern correspond to negated variables in ...
The cover of the book The C Programming Language, first edition, by Brian Kernighan and Dennis Ritchie. In 1978 Brian Kernighan and Dennis Ritchie published the first edition of The C Programming Language. [18] Known as K&R from the initials of its authors, the book served for many years as an informal specification of the language.
Christopher Wolfgang John Alexander (4 October 1936 – 17 March 2022) [1] [2] [3] was an Austrian-born British-American architect and design theorist.He was an emeritus professor at the University of California, Berkeley.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
The knowledge that northern and southern star patterns differed goes back to Classical writers, who describe, for example, the African circumnavigation expedition commissioned by Egyptian Pharaoh Necho II in c. 600 BC and those of Hanno the Navigator in c. 500 BC.
In combinatorics, stars and bars (also called "sticks and stones", [1] "balls and bars", [2] and "dots and dividers" [3]) is a graphical aid for deriving certain combinatorial theorems. It can be used to solve a variety of counting problems , such as how many ways there are to put n indistinguishable balls into k distinguishable bins. [ 4 ]