Why it may be extra hard to quit. Smokers often swear their 20 best friends are in a pack of cigarettesâand for some, this is more true than for others. Research has shown that while around 20 percent of Americans still light up, about 50 percent of those with depression do. And the figure jumps to between 70 and 90 percent for schizophrenics and people with bipolar disorder.
Tesseract is an optical character recognition engine for various operating systems.[2] It is free software, released under the Apache License, Version 2.0,[1][3][4] and development has been sponsored by Google since 2006.[5] In 2006 Tesseract was considered one of the most accurate open-source OCR engines then available.[4][6]
In mathematics, tetration (or hyper-4) is the next hyperoperator after exponentiation, and is defined as iterated exponentiation. The word was coined by Reuben Louis Goodstein, from tetra- (four) and iteration. Tetration is used for the notation of very large numbers. Shown here are examples of the first four hyperoperators, with tetration as the fourth (and succession, the unary operation denoted taking and yielding the number after, as the 0th): 1  Addition.