I noticed this on the page about infinity:
> Are some infinities larger than others?
But didn't Cantor prove the answer to that is "yes" back in the 19th century?
> Are some infinities larger than others?
But didn't Cantor prove the answer to that is "yes" back in the 19th century?
Also:
> If a mathematician wants to explore infinity, there are many options - for example by calculating π, or the square root of 2, or dividing any number by 0.
Er, one of these things is not like the others…
This clearly wasn't written by a mathematician.
Some infinite sets can be put into one-to-one correspondence with some of their proper subsets!
They say "Since the endpoints of (a₁, b₁) are x₁ and x₂", but in the example below a₁ = x₅, b₁ = x₁₂.
Am I missing something?