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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. Symmetric difference - Wikipedia

    en.wikipedia.org/wiki/Symmetric_difference

    Venn diagram of = . The symmetric difference is equivalent to the union of both relative complements, that is: [1] = (), The symmetric difference can also be expressed using the XOR operation ⊕ on the predicates describing the two sets in set-builder notation:

  5. 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 2 A {\displaystyle 2^{A}} or P ( A ) {\displaystyle P(A)} ; the " P " is sometimes in a script font: ⁠ ℘ ( A ...

  6. Mathematical diagram - Wikipedia

    en.wikipedia.org/wiki/Mathematical_diagram

    A Venn diagram is a representation of mathematical sets: a mathematical diagram representing sets as circles, with their relationships to each other expressed through their overlapping positions, so that all possible relationships between the sets are shown. [4]

  7. 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 ...

  8. 8 Overlooked Ways To Fund Your Holiday Purchases

    www.aol.com/finance/8-overlooked-ways-fund...

    Sam’s Club, for example, has a Landry’s $100 email delivery gift card for $79.98, limit two per membership. The card can be used at a variety of restaurants including Landry’s Seafood, Chart ...

  9. Inclusion–exclusion principle - Wikipedia

    en.wikipedia.org/wiki/Inclusion–exclusion...

    Inclusion–exclusion illustrated by a Venn diagram for three sets. Generalizing the results of these examples gives the principle of inclusion–exclusion. To find the cardinality of the union of n sets: Include the cardinalities of the sets. Exclude the cardinalities of the pairwise intersections.

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