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List Question

$L_1 =(a^nb^n)$ and $L_2 =(a^nb^{2n})$. Is $L_1 \cup L_2$ DCFL?

regular language proof, a language partial to a regular one

Did I find the right expression for the regular language for this FSA?

Blocks of Pyramid Pattern Expression

The set of strings over {a, b} that contain the substring a and the substring b

Give regular expression for the set of strings over $\{a,b,c\}$ with length AT MOST 3

DFA for all strings avoiding 'aa'

How to prove that the class of regular languages is closed under a homomorphism.

Finding regular expressions.

Pumping Lemma - Grammar - Regular language

Regular Expression Equality

How to prove that $q_1=xq_1+yq_1+\lambda$ is equal to $q_1=(x+y)^*$

Regular expression of the strings over {1,0} where all 11 occur before all 00

I am trying to find a regular expression for {Strings whose number of 0s is not divisible by 4}, with and without the use of complement.

Proving that languages are regular with pumping lemma

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