I went to check Adam Elga’s paper. It’s very short, only 5 pages written with a big font. He does ask
When you are first awakened, to what degree ought you believe that the outcome of the coin toss is Heads?
But he doesn’t mean that you (the person experimented upon) know that it’s your first awakening. Rather, it’s a way to single out Monday’s awakening for the sake of the reader. It’s obvious later in the paper:
If (upon first awakening) you were to learn that the toss outcome is Tails, that would amount to your learning that you are in either T1 or T2.
So the 2 versions of the problem on wikipedia are consistent. Still, if I was confused by the formulation of the first, I bet I’m not the only one.
I went to check Adam Elga’s paper. It’s very short, only 5 pages written with a big font. He does ask
But he doesn’t mean that you (the person experimented upon) know that it’s your first awakening. Rather, it’s a way to single out Monday’s awakening for the sake of the reader. It’s obvious later in the paper:
So the 2 versions of the problem on wikipedia are consistent. Still, if I was confused by the formulation of the first, I bet I’m not the only one.