## What is NFA with epsilon moves?

Nondeterministic finite automaton with ε-moves (NFA-ε) is a further generalization to NFA. This automaton replaces the transition function with the one that allows the empty string ε as a possible input. The transitions without consuming an input symbol are called ε-transitions.

**What is Epsilon NFA in automata?**

Non-deterministic Finite Automata (NFA) is a finite automata having zero, one or more than one moves from a given state on a given input symbol. Epsilon NFA is the NFA which contains epsilon move(s)/Null move(s).

**Does NFA have Epsilon transitions?**

The NFA with epsilon-transition is a ﬁnite state machine in which the transition from one state to another state is allowed without any input symbol i.e. empty string ε.

### How do I get rid of Epsilon moves in NFA?

Eliminating ε Transitions

- Find out all the ε transitions from each state from Q.
- Then δ’ transitions can be obtained.
- Repeat Step-2 for each input symbol and each state of given NFA.
- Using the resultant states, the transition table for equivalent NFA without ε can be built.

**Why epsilon NFA is used?**

In general, espilon-transitions are used when they are convenient. For example, when constructing an NFA from a regular expression, you start by constructing small parts of the automaton corresponding to parts of the expression. To connect them, you need to put a transition.

**Which is more powerful NFA vs DFA?**

(i) NFA is more powerful than DFA but DFA is more efficient than NFA. (ii) NFA will respond for only valid inputs and no need to respond for invalid inputs. (iii) There is no concept of dead states and complement in NFA. (iv) NFA is a parallel computing system where we can run multiple threads concurrently.

#### What is epsilon moves in TOC?

An epsilon transition (also epsilon move or lambda transition) allows an automaton to change its state spontaneously, i.e. without consuming an input symbol. It may appear in almost all kinds of nondeterministic automaton in formal language theory, in particular: Nondeterministic Turing machine.

**Does epsilon bring any change in the automata?**

Explanation: It adds nothing new to the automata.

**What is Kleene star automata?**

Definition − The Kleene star, ∑*, is a unary operator on a set of symbols or strings, ∑, that gives the infinite set of all possible strings of all possible lengths over ∑ including λ.

## Can epsilon closure of state be empty set?

Epsilon (∈) – closure : Epsilon closure for a given state X is a set of states which can be reached from the states X with only (null) or ε moves including the state X itself….Transition State Table for DFA corresponding to above NFA.

STATES | 0 | 1 |
---|---|---|

A, B, C | B, C | A, B, C |

C | C | C |

**Can a DFA accept epsilon?**

DFA doesn’t have epsilon transitions. If it had it, it could transit from current state to other state without any input i.e. with nothing , not even {} or phi.