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 January 21st, 2017, 06:56 PM #1 Newbie   Joined: Jan 2017 From: California Posts: 1 Thanks: 0 New blog: Infinity Plus One So, I've started a new blog, Infinity Plus One, discussing more advanced math topics, but aimed at a lay audience. I thought this forum looked like a place where people interested in this kind of resource (or who know those who would be) congregate. So, here are links for my first two posts. I hope you enjoy them. First post: Infinity plus one Second post: The size of infinity
January 21st, 2017, 08:35 PM   #2
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 Originally Posted by Ryleem So, I've started a new blog, Infinity Plus One, discussing more advanced math topics, but aimed at a lay audience. I thought this forum looked like a place where people interested in this kind of resource (or who know those who would be) congregate. So, here are links for my first two posts. I hope you enjoy them. First post: Infinity plus one Second post: The size of infinity
Nice work overall. But stop referring to infinity as a number. It is not in any way shape or form a number.

-Dan

January 21st, 2017, 08:56 PM   #3
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 Originally Posted by topsquark Nice work overall. But stop referring to infinity as a number. It is not in any way shape or form a number. -Dan
I think we tell calculus students this because they aren't yet equipped with methods to handle the number infinity. However, I disagree that infinity is not a number in any way. There are multiple contexts in which infinity is a perfectly good number and a blog discussing advanced math topics is likely to cover these.

January 21st, 2017, 10:17 PM   #4
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 Originally Posted by SDK I think we tell calculus students this because they aren't yet equipped with methods to handle the number infinity. However, I disagree that infinity is not a number in any way. There are multiple contexts in which infinity is a perfectly good number and a blog discussing advanced math topics is likely to cover these.
You can label the cardinal number $\displaystyle \aleph _0$ but you can't change the fact that you can't count to it.

I did make a slight mistake, however. I forget the name of the system but it is the real numbers with infinity attached, rather like the closure of the real line. I think it's called the extended real line or something of that nature.

-Dan

 January 21st, 2017, 10:22 PM #5 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,664 Thanks: 2644 Math Focus: Mainly analysis and algebra The extended real line doesn't include a number "infinity". It's more like a set of names for limit points. Thanks from topsquark

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