“Several years ago a frustrated philosophy professor said to me, "How can you know all this math but not know whether the number 2 even exists? Think about it!"

“Several years ago a frustrated philosophy professor said to me, "How can you know all this math but not know whether the number 2 even exists? Think about it!" So I did. And then I wrote about it for @sciam “ https://twitter.com/KelseyAHE/status/1169310784133971969?s=20 https://twitter.com/KelseyAHE/status/1169310784133971969?s=2...