Decius comments on Probabilistic Löb theorem - Less Wrong Discussion
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Comments (39)
P(A) ≥ (1-a)(1-b) U (a,b)>0 implies P(A) > (1-a-b). That's a (very slightly) stronger form. I noticed what I thought was an error where you were adding improbabilities together instead of multiplying.
The proof doesn't need the stronger form, however.