When one of the input cells changes, all the cells that depend on it need to react to that change — the aforementioned reactivity. In practice, though, this is the bare minimum requirement. When building reactive systems, there are usually some additional requirements we impose that make the problem harder:
Юлия Мискевич (Ночной линейный редактор)
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To allow compilers to do basic optimizations like common subexpression elimination on floating-point operations, languages therefore generally also say that they consider the status register to be not observable.
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