MHB Set Theory Questions (check if right)

ertagon2 · Mar 5, 2018

Could someone please check if these are right?
View attachment 7908

Opalg · Mar 5, 2018

Re: Set Theory Questions (check if irght)

ertagon2 said:

Could someone please check if these are right?

One part of q.1 is wrong. Everything else looks correct.

ertagon2 · Mar 5, 2018

Re: Set Theory Questions (check if irght)

Opalg said:

One part of q.1 is wrong. Everything else looks correct.

Which one? Looks alright to me.

Opalg · Mar 5, 2018

Re: Set Theory Questions (check if irght)

ertagon2 said:

Which one? Looks alright to me.

Only finitely many rational numbers between 4 and 6 ? (Doh)

ertagon2 · Mar 5, 2018

Re: Set Theory Questions (check if irght)

Opalg said:

Only finitely many rational numbers between 4 and 6 ? (Doh)

Isn't there a finite number of rational numbers for 4<x<6 ?

Opalg · Mar 5, 2018

Re: Set Theory Questions (check if irght)

ertagon2 said:

Isn't there a finite number of rational numbers for 4<x<6 ?

What about the numbers $4 + \dfrac1n$, for $n=1,\,2,\,3,\,\ldots$ ?

ertagon2 · Mar 5, 2018

Re: Set Theory Questions (check if irght)

Opalg said:

What about the numbers $4 + \dfrac1n$, for $n=1,\,2,\,3,\,\ldots$ ?

Oh nvm
I was thinking about countable and uncaountable.