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2. Venn diagram - Wikipedia

   en.wikipedia.org/wiki/Venn_diagram

   In Venn diagrams, a shaded zone may represent an empty zone, whereas in an Euler diagram, the corresponding zone is missing from the diagram. For example, if one set represents dairy products and another cheeses , the Venn diagram contains a zone for cheeses that are not dairy products.

3. Square of opposition - Wikipedia

   en.wikipedia.org/wiki/Square_of_opposition

   Square of opposition. The lower case letters (a, e, i, o) are used instead of the upper case letters (A, E, I, O) here in order to be visually distinguished from the surrounding upper case letters S (Subject term) and P (Predicate term). In the Venn diagrams, black areas are empty and red areas are nonempty. White areas may or may not be empty.

4. Boole's syllogistic - Wikipedia

   en.wikipedia.org/wiki/Boole's_syllogistic

   Square of opposition In the Venn diagrams black areas are empty and red areas are nonempty. The faded arrows and faded red areas apply in traditional logic. Boolean logic is a system of syllogistic logic invented by 19th-century British mathematician George Boole, which attempts to incorporate the "empty set", that is, a class of non-existent entities, such as round squares, without resorting ...

5. File:Square of opposition, set diagrams.svg - Wikipedia

   en.wikipedia.org/wiki/File:Square_of_opposition...

   Description: Square of opposition. In the Venn diagrams black areas tell, that the area is empty and red areas tell, that there is at least one element.. Faded red areas and faded arrows apply only in classical logic, where only nonempty domains are used.

6. File:Venn0111.svg - Wikipedia

   en.wikipedia.org/wiki/File:Venn0111.svg

   The 2x2 matrices show the same information like the Venn diagrams. (This matrix is similar to this Hasse diagram.) In set theory the Venn diagrams represent the set, which is marked in red. These 15 relations, except the empty one, are minterms and can be the case. The relations in the files below are disjunctions.

7. Set (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Set_(mathematics)

   A set of polygons in an Euler diagram This set equals the one depicted above since both have the very same elements.. In mathematics, a set is a collection of different [1] things; [2] [3] [4] these things are called elements or members of the set and are typically mathematical objects of any kind: numbers, symbols, points in space, lines, other geometrical shapes, variables, or even other ...

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   www.aol.com/games

   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

9. Naive set theory - Wikipedia

   en.wikipedia.org/wiki/Naive_set_theory

   The empty set is a subset of every set (the statement that all elements of the empty set are also members of any set A is vacuously true). The set of all subsets of a given set A is called the power set of A and is denoted by or (); the "P" is sometimes in a script font: ⁠ ℘ ⁠.