projection

n 1: a prediction made by extrapolating from past observations

2: the projection of an image from a film onto a screen

3: a planned undertaking [syn: {project}]

4: anything that branches out from a central support [syn: {protuberance}]

5: any solid convex shape that juts out from something

6: a defense mechanism by which your own traits and emotions

are attributed to someone else

7: the representation of a figure or solid on a plane as it

would look from a particular direction

8: the act of projecting out from something [syn: {protrusion},

{jut}, {jutting}]

9: the act of expelling or projecting or ejecting [syn: {expulsion},

{ejection}, {forcing out}]

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.

(1997-01-29)