Alexsandro's Prize Quest: Brain Teasers and Grand Prizes

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The discussion revolves around Alexsandro's engagement with probability questions, which he is studying to enhance his understanding and mental exercise. Participants express curiosity about the purpose of the questions, questioning whether they are for homework, exams, or simply for fun. Alexsandro seeks assistance and feedback on the questions he has posted, indicating a desire for collaborative learning. There is also a mention of a private messaging system for more direct communication among users. Overall, the thread emphasizes a community effort to tackle brain teasers and improve knowledge in probability.
EnumaElish
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Dude! What are these questions for? Homework? Exam? Fun? Hobby? Brain teasers (mind gymnastics)? Are you tallying up points? Is there a grand prize? :smile:
 
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Hello,

I am studying these questions on probability to assimilate the concepts better and to exercise my mind. I am sending for the list to learn more with the opinion and the answers of the participants. If we thinks that I am exaggerating, sorry. I don't post more question. If we could help me with the questions that I sent, I thank.
 
Just FYI, we also have a private messaging system! Try going through your user control panel, or click on your target's name on one of his posts.
 
Oh, okay. Thanks, Hurkyl.
 
I was reading documentation about the soundness and completeness of logic formal systems. Consider the following $$\vdash_S \phi$$ where ##S## is the proof-system making part the formal system and ##\phi## is a wff (well formed formula) of the formal language. Note the blank on left of the turnstile symbol ##\vdash_S##, as far as I can tell it actually represents the empty set. So what does it mean ? I guess it actually means ##\phi## is a theorem of the formal system, i.e. there is a...
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