Lattice

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According to wikipedia, Lattice is a data type that is represented as directed arrows that doesn't create loopy structures. This is also known as POSet for Partially-ordered set. According to Dana Scott[1], it is considered to be the build ing block of all of computation. It is also used as the main instrument to reason able correctness or safety/liveness properties of complex systems.

  1. Scott, Dana (January 1, 1970). "Outline of a Mathematical Theory of Computation". local page: Oxford University Computing Laboratory Programming Research Group.