Table of Contents

## What does context-free mean?

Definition of context-free : of, relating to, or being a grammar or language based on rules that describe a change in a string without reference to elements not in the string also : being such a rule.

**What is context-free language with example?**

In formal language theory, a context-free language (CFL) is a language generated by a context-free grammar (CFG). Context-free languages have many applications in programming languages, in particular, most arithmetic expressions are generated by context-free grammars.

### What does context-free mean in computer science?

A context-free grammar is a set of recursive rules used to generate patterns of strings. A context-free grammar can describe all regular languages and more, but they cannot describe all possible languages. Context-free grammars are studied in fields of theoretical computer science, compiler design, and linguistics.

**What is context-free grammar in automata?**

CFG stands for context-free grammar. It is is a formal grammar which is used to generate all possible patterns of strings in a given formal language. Context-free grammar G can be defined by four tuples as: G = (V, T, P, S)

#### Which language is context-free?

Context-Free Language (CFL) is a language which is generated by a context-free grammar or Type 2 grammar(according to Chomsky classification) and gets accepted by a Pushdown Automata. Some very much important properties of a context-free language is: Regularity- context-free languages are Non-Regular PDA language.

**What is the difference between context-free and context sensitive grammar?**

In context sensitive grammar, there is either left context or right context (αAβ i.e. α is left context and β is right) with variables. But in context free grammar (CFG) there will be no context. We cannot replace B until we get B0. Therefore, CSG is harder to understand than the CFG.

## Which of the following are context-free?

Every regular language is context free. | m, l, k, n >= 1 } is context free, as it is regular too. Given an expression such that it is possible to obtain a center or mid point in the strings, so we can carry out comparison of left and right sub-parts using stack.

**Which of the following languages is are context-free?**

Explanation: Context free languages are closed under the following operation: union, kleene and concatenation. For regular languages, we can add intersection and complement to the list.

### What does not context-free mean?

Given the technical definition of what a language is and what context-free is, it means that in the processing of rules defining the language, no context is used. That is, any variable is rewritten by itself, with no context.

**What is the difference between context-free and context-sensitive grammar?**

#### What is context-free grammar Geeksforgeeks?

Context Free Grammars (CFG) can be classified on the basis of following two properties: 1) Based on number of strings it generates. If CFG is generating finite number of strings, then CFG is Non-Recursive (or the grammar is said to be Non-recursive grammar)

**How do you prove context-free?**

A grammar is context-free if left-hand sides of all productions contain exactly one non-terminal symbol. By definition, if one exists, then the language is context-free.