<programming language>

Logic of Inheritance, Functions and Equations.

An object-oriented, functional, constraint-based language by Hassan Ait-Kacy <hak@prl.dec.com> et al of MCC, Austin TX, 1987. LIFE integrates ideas from LOGIN and LeFun.

Mailing list: life-users@prl.dec.com.

See also: Wild_LIFE.

["Is There a Meaning to LIFE?", H. Ait-Kacy et al, Intl Conf on Logic Prog, 1991].

(01 Mar 1995)

Lieutaud's triangle, Lieutaud's trigone, Lieutaud's uvula, LIF < Prev | Next > Life, life, life

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<computer games> The first popular cellular automata based artificial life "game". Life was invented by British mathematician John Horton Conway in 1970 and was first introduced publicly in "Scientific American" later that year.

Conway first devised what he called "The Game of Life" and "ran" it using plates placed on floor tiles in his house. Because of he ran out of floor space and kept stepping on the plates, he later moved to doing it on paper or on a checkerboard, and then moved to running Life as a computer program on a PDP-7. That first implementation of Life as a computer program was written by M. J. T. Guy and S. R. Bourne (the author of Unix's Bourne shell).

Life uses a rectangular grid of binary (live or dead) cells each of which is updated at each step according to the previous state of its eight neighbours as follows: a live cell with less than two, or more than three, live neighbours dies. A dead cell with exactly three neighbours becomes alive. Other cells do not change.

While the rules are fairly simple, the patterns that can arise are of a complexity resembling that of organic systems -- hence the name "Life".

Many hackers pass through a stage of fascination with Life, and hackers at various places contributed heavily to the mathematical analysis of this game (most notably Bill Gosper at MIT, who even implemented Life in TECO!; see Gosperism). When a hacker mentions "life", he is more likely to mean this game than the magazine, the breakfast cereal, the 1950s-era board game or the human state of existence.



["Scientific American" 223, October 1970, p120-123, 224; February 1971 p121-117, Martin Gardner].

["The Garden in The Machine: the Emerging Science of Artificial Life", Claus Emmeche, 1994].

["Winning Ways, For Your Mathematical Plays", Elwyn R. Berlekamp, John Horton Conway and Richard K. Guy, 1982].

["The Recursive Universe: Cosmic Complexity and the Limits of Scientific Knowledge", William Poundstone, 1985].

(01 Mar 1997)

Lieutaud's trigone, Lieutaud's uvula, LIF, LIFE < Prev | Next > life, life, life-belt cataract

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<jargon> The opposite of Usenet. As in "Get a life!"

(01 Mar 1995)

Lieutaud's uvula, LIF, LIFE, Life < Prev | Next > life, life-belt cataract, lifeblood

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Origin: AS. Lf; akin to D. Lijf body, G. Leib body, MHG. Lp life, body, OHG. Lb life, Icel. Lf, life, body, Sw. Lif, Dan. Liv, and E. Live, v. See Live, and cf. Alive.

1. The state of being which begins with generation, birth, or germination, and ends with death; also, the time during which this state continues; that state of an animal or plant in which all or any of its organs are capable of performing all or any of their functions; used of all animal and vegetable organisms.

2. Of human being: The union of the soul and body; also, the duration of their union; sometimes, the deathless quality or existence of the soul; as, man is a creature having an immortal life. "She shows a body rather than a life." (Shak)

3. <philosophy> The potential principle, or force, by which the organs of animals and plants are started and continued in the performance of their several and cooperative functions; the vital force, whether regarded as physical or spiritual.

4. Figuratively: The potential or animating principle, also, the period of duration, of anything that is conceived of as resembling a natural organism in structure or functions; as, the life of a state, a machine, or a book; authority is the life of government.

5. A certain way or manner of living with respect to conditions, circumstances, character, conduct, occupation, etc.; hence, human affairs; also, lives, considered collectively, as a distinct class or type; as, low life; a good or evil life; the life of Indians, or of miners. "That which before us lies in daily life." (Milton) "By experience of life abroad in the world." (Ascham) "Lives of great men all remind us We can make our lives sublime." (Longfellow) "'T is from high life high characters are drawn." (Pope)

6. Animation; spirit; vivacity; vigor; energy. "No notion of life and fire in fancy and in words." (Felton) "That gives thy gestures grace and life." (Wordsworth)

7. That which imparts or excites spirit or vigor; that upon which enjoyment or success depends; as, he was the life of the company, or of the enterprise.

8. The living or actual form, person, thing, or state; as, a picture or a description from, the life.

9. A person; a living being, usually a human being; as, many lives were sacrificed.

10. The system of animal nature; animals in general, or considered collectively. "Full nature swarms with life." (Thomson)

11. An essential constituent of life, especially: the blood. "The words that I speak unto you . . . They are life." (John vi. 63) "The warm life came issuing through the wound." (Pope)

12. A history of the acts and events of a life; a biography; as, Johnson wrote the life of Milton.

13. Enjoyment in the right use of the powers; especially, a spiritual existence; happiness in the favor of God; heavenly felicity.

14. Something dear to one as one's existence; a darling; used as a term of endearment.

Life forms the first part of many compounds, for the most part of obvious meaning; as, life-giving, life-sustaining, etc. Life annuity, an annuity payable during one's life. Life arrow, Life rocket, Life shot, an arrow, rocket, or shot, for carrying an attached line to a vessel in distress in order to save life. Life assurance. See Life insurance, below. Life buoy. See Buoy. Life car, a water-tight boat or box, traveling on a line from a wrecked vessel to the shore. In it person are hauled through the waves and surf. Life drop, a drop of vital blood. Life estate A line along any part of a vessel for the security of sailors. A line attached to a life boat, or to any life saving apparatus, to be grasped by a person in the water. Life rate, rate of premium for insuring a life. Life rent, the rent of a life estate; rent or property to which one is entitled during one's life. Life school, a school for artists in which they model, paint, or draw from living models. Lifetable, a table showing the probability of life at different ages. To lose one's life, to die. To seek the life of, to seek to kill. To the life, so as closely to resemble the living person or the subject; as, the portrait was drawn to the life.

(01 Mar 1998)

Lieutaud's uvula, LIF, LIFE, Life, life < Prev | Next > life-belt cataract, lifeblood, life change events

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