User:CircuitCraft/Definition:Abstract Machine/Halting
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Definition
Let $M = \struct {S, \vdash}$ be an abstract machine.
Let $a \in S$ be a configuration.
Let there exist $N \in \N$ such that there does not exist a finite sequence:
- $a \vdash s_1 \vdash \dotso \vdash s_N$
Then $M$ halts from $a$.