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projection

   Also found in: Dictionary/thesaurus, Medical, Financial, Wikipedia, Hutchinson 0.02 sec.
projection, in psychology: see defense mechanism defense mechanism, in psychoanalysis, any of a variety of unconscious personality reactions which the ego uses to protect the conscious mind from threatening feelings and perceptions.
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See rear-projection TV, front-projection TV and LCD panel.

(theory)projection - In domain theory, a function, f, which is (a) idempotent, i.e. f(f(x))=f(x) and (b) whose result is no more defined than its argument. E.g. F(x)=bottom or F(x)=x.

In reduction systems, a function which returns some component of its argument. E.g. head, tail, \ (x,y) . x. In a graph reduction system the function can just return a pointer to part of its argument and does not need to build any new graph.


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Indeed, one of his best-known poems, "The Return to the Mountains", makes mention of the projection of the astral body through space during sleep.
A Lute of Jade by Cranmer-Byng, L. View in context
With a pair of cutters he snipped off the projection which extended through the dial from the external pointer--now the latter might be moved to any point upon the dial without affecting the mechanism below.
Thuvia, Maid of Mars by Burroughs, Edgar Rice View in context
Now one perceived with affright at the very top of one of the towers, a fantastic dwarf climbing, writhing, crawling on all fours, descending outside above the abyss, leaping from projection to projection, and going to ransack the belly of some sculptured gorgon; it was Quasimodo dislodging the crows.
Notre-Dame de Paris by Hugo, Victor View in context
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