User:CircuitCraft/Definition:Abstract Machine/Reachable Configuration
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Definition
Let $\struct {S, \vdash}$ be an abstract machine.
Let $a, b \in S$ be configurations.
$b$ is reachable from $a$ if and only if there is a finite sequence $\sequence {s_0, s_1, \dotsc, s_n}$ such that:
- $a = s_0 \vdash s_1 \vdash \dotso \vdash s_n = b$