Thread: Unsolved paradoxes

Hangman's Paradox is a real brain breaker

My thoughts on The Grandfather paradox are that it depends on the way how someone views time:
1. If we look at it as a single line. Then the moment you go to the past and kill your grandfather you will vanish and the past and the future after it will be changed. The fact the in the future you do not exist to kill him wont change anything.
2. If we look at it a tree. Infinite number of parallel universes. Each created when there is a choice.
In that case when you go back in time and kill your grandfather. You will create another path of time (or parallel universe). But then you will be stuck in it. So when you try to go back in the future, you will go to a time where you do not exist. And the universe where you exist will not be available to you.

And the Monty Hall problem - you can prove it mathematically that if you swap the door the chances actually rise.
I'm studying the probability for the last 6 months in University. But even thou you can prove it, the chances are the same.
The fact is that your probability to win a car raises if you choose again between 2 doors. Not only if you swap the choice. (but this is only mathematically, actual chances are the same)

Strictly the paradox should say that the barber only shaves those who don't shave themselves. It is a contradiction.

Originally Posted by Ivan452

And the Monty Hall problem - you can prove it mathematically that if you swap the door the chances actually rise.
I'm studying the probability for the last 6 months in University. But even thou you can prove it, the chances are the same.
The fact is that your probability to win a car raises if you choose again between 2 doors. Not only if you swap the choice. (but this is only mathematically, actual chances are the same)

lolwat

Why do you think there is a difference between mathematical probability and 'chances'? They're the same thing. If you swap, your chances of winning are 2/3. If you don't, they're 1/3.

Originally Posted by Xei

Strictly the paradox should say that the barber only shaves those who don't shave themselves. It is a contradiction.

I figured, but it didn't. I had to pounce at that. But it still doesn't rule out that the barber just doesn't shave.