I am having trouble discovering how to convert a ε-NFA to DFA (image below) when all transitions in the initial state are epsilon transitions. I already know how to convert ε-NFA to DFA (common cases), but this case I never saw before.

Thank you guys!



1 Answer 1


Here is an algorithm to convert an $\epsilon$-NFA to an equivalent DFA.

Let the $\epsilon$-NFA consist of a set of states $Q$, an initial state $q_0$, a set of accepting states $F$, and a transition function. We construct a DFA on the set of states $2^Q$ (the power set of $Q$). The initial state is the $\epsilon$-closure of $q_0$ (the set of all states in $Q$ reachable from $q_0$ by a path of $\epsilon$-transitions). A state is accepting if it intersects $F$. We define the transition function $\delta$ as follows: given a state $S \in 2^Q$ and a letter $a$, $\delta(S,a)$ consists of all states in $Q$ reachable from a state in $S$ by taking an $a$-transition followed by a path of $\epsilon$-transitions.


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