The BBT does not posit a beginning. It posits a point in time after the beginning.
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Reference to “after the beginning” in your second sentence appears to contradict your first sentence since it posits a beginning.
“Reference to “after the beginning” in your second sentence appears to contradict your first sentence since it posits a beginning.”
I was using the other poster’s words so came out unclear.
More technically, the BBT implies a “beginning” of the universe but does not address it as part of the theory.
The theory begins with the universe as a high density plasma.