My question is, what is the BGV theorem? and what exactly does it say?(adsbygoogle = window.adsbygoogle || []).push({});

I was watching A debate on cosmology where William Lane Craig uses the Borde, Guth and Vilenkin theorem to say the universe had a beginning.

I was wondering if someone could possibly explain the case of the BGV theorem and what it says?

Does this theorem make other cosmologies such as the Hawking-Hartle less likely than one that had a beginning?

If this subject has already been answered, could someone refer me to a link?

Thanks so much if you are able to help out :) !

Mentor note: edited to remove debate video reference.

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# B What is the Borde-Guth-Vilenkin theorem?

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