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Excel function for multi-criteria selection problems
...At the same time, our model can incorporate some user control by ranking of relative importance of the criteria. [...] decision makers only rank the relative importance of criteria, rather than specifying the degree of relativity. [...] [our model] does not require users with any optimization background."
Worldlines visualizes special relativity, as particles near lightspeed trace paths in a 3D slice of 4D Minkowski spacetime. Scenes illustrate time dilation, the twin paradox, length contraction, and Bell's spaceship paradox.
The Physics 3d Simulations Project, intends to be a educational tool, for helping science students understanding physics concepts of Classical Mechanics, Eletrodynamics, Chaos, Relativity and others.