# Recent questions tagged ricestheorem

If a language satisfies monotonic property then is it REL or REC or NOT REL ?? And What about CO- REL?? #RICE THEOREM
What are the languages, RE or not RE? Please explain using Rice’s theorem or otherwise. 1) L={⟨M⟩|TM halts on empty string} 2) L={⟨M⟩|TM halts on empty string} 3) L={⟨M⟩|TM halts on no input} Not sure how rice’s theorem is working here.
Here in place of or if and was given then is it correct: $T_{yes}=\{a,b\} \ \ T_{no}=\{\ \Sigma^* \}$ Here for $T_{yes}$ x = a or b is in the language, but let y = ab is not in the langugage, in $T_{no}$ there is no x or y which ... since the language of $T_{no}$ is universal language also $T_{yes}$ is a proper subset of $T_{no}$ so the language is not RE. Please provide your valuable inputs.