self doubt

Question

difference between empty language and empty string

Comments

empty language means language(set) does not have any string means empty set i.e. $\phi$

empty string means string of length $0$ i.e. $\Sigma^{0}$ or $\epsilon$

Answer 1

Consider an empty box in an empty bag. 

1. If box -- whether empty or not is in the bag -- can it really be empty? -- NO. 
2. Only if nothing is in the bag, it is empty.

Now, replace boxes with strings and bags with languages. 

1. If no string is in a language it is empty -- $\{\}$
2. If string is empty (no characters in it usually denoted by $\epsilon$) it resembles an empty box
3. Even an empty string makes a language not empty -- $\{\epsilon\}$

Comments

beauty 😊

Answer 2

Empty language is a language which contains nothing( no strings at all ). But whereas empty string is a string of length '0'.( which we call it epsilon)

A language is said to be not empty even if it contains empty string.