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In system design using use case diagrams are all use cases initiated/done by the external user: e.g. add line item, print receipt Or can use cases be entirely internal/automatic: e.g. calculate running total, or even present running total In regards to the second example would a cashier system have a use case of present runningRead more

I am currently establishing a database for Students and Courses using ERD. The style of ERD I am using is similar to the diagram below from the ERD Diagram Question: Note: The picture above is NOT my ERD, this is just the style of ERD I am using. A simple CREATE statment could be usedRead more

I am trying to make a phase space diagram, however, I don’t know how use mathematica. The equation system is: dx/dt=x+y, dy/dt=-x+3/8-4x If someone could write the whole text I must write in the program (the ooption of seeing the diagram too) I would be really thanked. Thanks for your time.Read more

I am studying modelling and UML through a presentation based on Craig Larman’s book “Applying UML and Patterns”. It describes seven consecutive design steps, from the requirement analysis to the class diagram: Software Requirements Specification, Use Case Diagrams, Conceptual Model, System Sequence Diagrams, Contracts, Collaboration Diagrams, Design Class Diagrams. I am trying to find theseRead more

I’ve heard about two ways mathematician describe Feynman diagrams: They can be seen as “string diagrams” describing various type of arrows (and/or compositions operations on them) in monoidal closed category. They are combinatorial tools that allows to give formulas the asymptotical expansion of integrals for the form: $ $ \int_{\mathbb{R}^n} g(x) e^{-S(x)/\hbar} $ $ whenRead more

It is well known that for a functor $ F: \mathcal R \to \mathcal M$ , where $ \mathcal R$ is a Reedy category and $ \mathcal M$ is suitably bicomplete, the following decomposition determines the structure around $ y \in \mathcal R$ : $ $ Latch(F)(y) \to F(y) \to Match(F)(y); $ $ here weRead more