Recent content by bahamagreen
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B Question about the Entropy of a Black Hole Singularity
When you started with entropy, did you run across Don Page's argument that "...if a black hole starts in a pure quantum state and evaporates completely by a unitary process, the von Neumann entropy of the Hawking radiation initially increases and then decreases back to zero when the black hole...- bahamagreen
- Post #18
- Forum: Special and General Relativity
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I A variation of the sleeping beauty problem
Thanks, that is very clear. You are distinguishing the probability of heads given awakening event as a separate thing from the probability of the tossed coin being heads. Looks to me like the word credence (mental acceptance as true or real) has two different domains depending on whether inside...- bahamagreen
- Post #33
- Forum: Set Theory, Logic, Probability, Statistics
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I A variation of the sleeping beauty problem
Before you give up on me, could you show the 1/3 calculation?- bahamagreen
- Post #30
- Forum: Set Theory, Logic, Probability, Statistics
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I A variation of the sleeping beauty problem
Ibex Once started, the only event known to have occurred is the coin toss and the Monday waking. She may awake either two or three times, that last time on Wednesday in which she will not know if it is Monday, Tuesday, or Wednesday until they announce the end of the project. When she awakes at...- bahamagreen
- Post #28
- Forum: Set Theory, Logic, Probability, Statistics
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I A variation of the sleeping beauty problem
its the probability of awakenings before Wednesday ... from Ibix's link... "I’ve just observed an event (D = waking up before Wednesday) that is twice as likely under the tails scenario..." I'm not seeing the twice as likely; the Monday waking is certain (p=1), the Tuesday waking based on coin...- bahamagreen
- Post #25
- Forum: Set Theory, Logic, Probability, Statistics
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I A variation of the sleeping beauty problem
I going to go look at theory of conditional probabilities ... (Wikipedia) P(A|B)=(P(A^B))/P(B) Where "^" is intersection and B is Monday awakening A is Tuesday awakening P(B)=1 P(A)=.5 P(A|B)= P(.5^1)/1=.5- bahamagreen
- Post #21
- Forum: Set Theory, Logic, Probability, Statistics
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I A variation of the sleeping beauty problem
Can you reconcile the two different questions having different answers? Actions that depend on the coin do not include Monday. What happens Monday is strictly determined up to asking SB's credence; why would Monday be included? How do actions that depend on the known outcome of the coin...- bahamagreen
- Post #16
- Forum: Set Theory, Logic, Probability, Statistics
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I A variation of the sleeping beauty problem
The Monday awakening is unconditional, independent of the coin flip result, independent of when the coin is flipped, and independent of when the result is observed. The experiment does not really begin until Tuesday, the Tuesday awakening conditional on the coin flip, independent of Monday. What...- bahamagreen
- Post #12
- Forum: Set Theory, Logic, Probability, Statistics
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I A variation of the sleeping beauty problem
I think .5 is the answer. The order of events: Complete information about the experimental procedure is explained to SB A fair coin is flipped, SB does not know the result Sunday evening: - some analyses explore SB's hypothetical credence of Heads assessed Sunday evening (and maybe Wednesday...- bahamagreen
- Post #9
- Forum: Set Theory, Logic, Probability, Statistics
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B Logic Problem: Figuring Out How Many Apples Each Man Ate
You're right... I see 20 coherent solutions that follow the replies and sum to 11. Only if Kurt ate 5 will present a unique solution... A B G K ======== 1 2 3 5 <------- unique solution for Kurt 1 2 4 4 1 3 3 4 1 3 4 3 1 4 3 3 1 4 4...- bahamagreen
- Post #10
- Forum: Set Theory, Logic, Probability, Statistics
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B Logic Problem: Figuring Out How Many Apples Each Man Ate
Thinking about the "Aha" question has made me believe Kurt is the first to know unless George ate 2 apples, then George is the first to know! Alonso's question reveals he either ate 1, 2, 3, or 4 apples Bert's reply reveals he either ate 1, 2, or 3 apples George's reply reveals he either ate 1...- bahamagreen
- Post #8
- Forum: Set Theory, Logic, Probability, Statistics
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B Logic Problem: Figuring Out How Many Apples Each Man Ate
Hi Dale, what are your thoughts on this? It is based on the stipulation "...by only asking questions that they didn't know the answers to." Alonso asks "Bert, did you eat more apples than I did?" Alonso can only ask this question not knowing the answer only if he did not eat more than 4...- bahamagreen
- Post #6
- Forum: Set Theory, Logic, Probability, Statistics
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B Squaring finite decimals of 2/3 and 1/3 - growing patterns
I was doing some probability calculations that include squaring a number between 0 and 1. When I approximate 2/3 using 0.6 or 0.66 or 0.666 etc. I get an interesting series of growing same digit segments... 0.6^2=0.36 0.66^2=0.4356 0.666^2=0.443556 0.6666^2=0.44435556 0.66666^2=0.4444355556...- bahamagreen
- Thread
- Replies: 1
- Forum: General Math
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B What does it mean to say the Universe is the same everywhere?
Hope it's OK to add a question here. I think to pertains to the topic. What did cosmologists mean by "looks the same from everywhere"? Were they adjusting and calculating to compare "distant local" to "nearby local"? Or were they comparing raw values? There was a time when both expansion...- bahamagreen
- Thread
- Replies: 8
- Forum: Cosmology
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B Are there two kinds of inverse with respect to closure?
OK, thanks; I was using "yes" meaning for all numbers of the set with no exceptions or conditions attached. Is there an "exclusive yes" like exclusive or?- bahamagreen
- Post #15
- Forum: General Math