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  2. Mathematical structure - Wikipedia

    en.wikipedia.org/wiki/Mathematical_structure

    In mathematics, a structure on a set (or on some sets) refers to providing it (or them) with certain additional features (e.g. an operation, relation, metric, or topology). Τhe additional features are attached or related to the set (or to the sets), so as to provide it (or them) with some additional meaning or significance.

  3. Three levels of leadership model - Wikipedia

    en.wikipedia.org/wiki/Three_levels_of_leadership...

    The three levels referred to in the model's name are Public, Private and Personal leadership. The model is usually presented in diagram form as three concentric circles and four outwardly directed arrows, with personal leadership in the center. The first two levels – public and private leadership – are "outer" or "behavioral" levels ...

  4. Diagram (mathematical logic) - Wikipedia

    en.wikipedia.org/wiki/Diagram_(mathematical_logic)

    In model theory, a branch of mathematical logic, the diagram of a structure is a simple but powerful concept for proving useful properties of a theory, for example the amalgamation property and the joint embedding property, among others.

  5. Join and meet - Wikipedia

    en.wikipedia.org/wiki/Join_and_meet

    If (,) is a partially ordered set, such that each pair of elements in has a meet, then indeed = if and only if , since in the latter case indeed is a lower bound of , and since is the greatest lower bound if and only if it is a lower bound. Thus, the partial order defined by the meet in the universal algebra approach coincides with the original ...

  6. Pyramid scheme - Wikipedia

    en.wikipedia.org/wiki/Pyramid_scheme

    Eventually, all of the people at the lower levels of the pyramid do not make any money; only the people at the top turn a profit. [4] People in the upper layers of the pyramid typically profit, while those in the lower layers typically lose money. Since most of the members in the scheme are at the bottom, most participants will not make any money.

  7. Borromean rings - Wikipedia

    en.wikipedia.org/wiki/Borromean_rings

    The commonly-used diagram for the Borromean rings consists of three equal circles centered at the points of an equilateral triangle, close enough together that their interiors have a common intersection (such as in a Venn diagram or the three circles used to define the Reuleaux triangle).

  8. Unified Modeling Language - Wikipedia

    en.wikipedia.org/wiki/Unified_Modeling_Language

    A diagram is a partial graphic representation of a system's model. The set of diagrams need not completely cover the model and deleting a diagram does not change the model. The model may also contain documentation that drives the model elements and diagrams (such as written use cases). UML diagrams represent two different views of a system ...

  9. Topology optimization - Wikipedia

    en.wikipedia.org/wiki/Topology_optimization

    Topology optimisation for fluid structure interaction problems has been studied in e.g. references [12] [13] [14] and. [15] Design solutions solved for different Reynolds numbers are shown below. The design solutions depend on the fluid flow with indicate that the coupling between the fluid and the structure is resolved in the design problems.