Main

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4

site type

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review version

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html import

20 (imported)

Events

first seen date

2024-09-23 13:10:44

expired found date

-

created at

2024-09-23 13:10:44

updated at

2025-12-29 17:30:52

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Server

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Mainpage statistics

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20

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Open Graph

title

description

image

site name

author

updated

2026-02-17 16:35:48

raw text

Knowledge Problems Knowledge Problems Monday, August 13, 2007 The Fundamental Operation: Projection To illustrate a further important point, below is an actual object-property table. It shows 10 objects and 5 attributes. You can think of it as representing 10 objects that just came off an assembly line. Each of those objects has 5 properties, for example `\{P_1,P_2,P_3,P_4,P_5\}=\{text{color},text{shape},text{texture},text{size},text{orientation}\}`. Thus, for example, these objects can have three possible colors, `P_1 in \{0,1,2\}`, which might be `\{text{blue},text{red},text{green}\}`. It can be noted that not all of the objects need be distinct, and in fact there are several identical objects in this set. (Can you find them? Just kidding.) Object Property   `P_1` `P_2 `P_3` `P_4` `P_5` `O_1` 1 2 0 1 1 `O_2` 1 2 0 1 1 `O_3` 2 0 0 1 0 `O_4` 0 0 1 2 1 `O_5` 2 1 0 2 1 `O_6` 0 0 1 2 2 ...

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