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  2. Learn about uses, how it works, and more for Viagra (sildenafil). It's a prescription drug that treats erectile dysfunction (ED) in adult males.

  3. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    The blackboard bold typeface is widely used for denoting the basic number systems. These systems are often also denoted by the corresponding uppercase bold letter. A clear advantage of blackboard bold is that these symbols cannot be confused with anything else. This allows using them in any area of mathematics, without having to recall their ...

  4. List of Unified Modeling Language tools - Wikipedia

    en.wikipedia.org/wiki/List_of_Unified_Modeling...

    Based on ITU-T Z.109 UML profile, SDL-RT, SDL. The model can be simulated and can be exported to model checking tools. Full testing environment integrated based on TTCN-3. ArgoUML: No Yes Yes Un­known C++, C#, Java, PHP4, PHP5, Ruby Java (other languages with plugins) Un­known Closely follows the UML standard Astah: Yes No Yes Yes

  5. Unified Modeling Language - Wikipedia

    en.wikipedia.org/wiki/Unified_Modeling_Language

    UML logo. The unified modeling language (UML) is a general-purpose visual modeling language that is intended to provide a standard way to visualize the design of a system. [1] UML provides a standard notation for many types of diagrams which can be roughly divided into three main groups: behavior diagrams, interaction diagrams, and structure ...

  6. Architectural pattern - Wikipedia

    en.wikipedia.org/wiki/Architectural_pattern

    Following traditional building architecture, a software architectural style is a specific method of construction, characterized by the features that make it notable.. An architectural style defines: a family of systems in terms of a pattern of structural organization; a vocabulary of components and connectors, with constraints on how they can be combined.

  7. Observer pattern - Wikipedia

    en.wikipedia.org/wiki/Observer_pattern

    The observer design pattern is a behavioural pattern listed among the 23 well-known "Gang of Four" design patterns that address recurring design challenges in order to design flexible and reusable object-oriented software, yielding objects that are easier to implement, change, test and reuse.

  8. Model–view–controller - Wikipedia

    en.wikipedia.org/wiki/Model–view–controller

    Model–view–controller (MVC) is a software design pattern [1] commonly used for developing user interfaces that divides the related program logic into three interconnected elements.

  9. Communist Party of Nepal (Unified Marxist–Leninist) - Wikipedia

    en.wikipedia.org/wiki/Communist_Party_of_Nepal...

    Alternative flag of CPN (UML) The election symbol of CPN (UML) is the sun which is also present in the party logo. [94] The hammer and sickle, a common symbol of communism, is also used in the party flag and logo. The party constitution determines that a golden hammer and sickle inside a red sun is the party's logo. [95]