question: Which theorems require the existence of a singularity at the beginning of time ?
answer: The Penrose -- Hawking singularity theorems
turker_answer: The Penrose -- Hawking singularity theorems require the existence of a singularity at the beginning of time .
rule-based: The Penrose -- Hawking singularity theorems require the existence of a singularity at the beginning of time .