### Boole’s Rings

- The rearrangement number: how many rearrangements of a series suffice to verify absolute convergence? Mathematics Colloquium at Penn, September 2016 July 30, 2016 Joel David Hamkins
- Set-theoretic geology and the downward-directed grounds hypothesis, CUNY Set Theory seminar, September 2016 July 30, 2016 Joel David Hamkins
- Crecimiento en grupos y otras estructuras July 19, 2016 Nick Gill
- More notions of forcing add a Souslin tree July 17, 2016 Assaf Rinot
- In praise of some history July 9, 2016 Asaf Karagila

### Comments on Boole’s Rings

- Comment on Math for nine-year-olds: fold, punch and cut for symmetry! by Joel David Hamkins July 30, 2016 Comments for Joel David Hamkins
- Comment on Math for nine-year-olds: fold, punch and cut for symmetry! by Cathy O'Neil July 30, 2016 Comments for Joel David Hamkins
- Comment on Set-theoretic geology and the downward-directed grounds hypothesis, CUNY Set Theory seminar, September 2016 by Joel David Hamkins July 30, 2016 Comments for Joel David Hamkins
- Comment on Set-theoretic geology and the downward-directed grounds hypothesis, CUNY Set Theory seminar, September 2016 by Joel David Hamkins July 30, 2016 Comments for Joel David Hamkins
- Comment on Set-theoretic geology and the downward-directed grounds hypothesis, CUNY Set Theory seminar, September 2016 by allenknutson July 30, 2016 Comments for Joel David Hamkins

# Tag Archives: Reverse Mathematics

## Computable roots of computable functions

Here are several interesting results from computable analysis: Theorem 1. If $f$ is a computable function from $\mathbb{R}$ to $\mathbb{R}$ and $\alpha$ is an isolated root of $f$, then $\alpha$ is computable. Corollary 2. If $p(x)$ is a polynomial over … Continue reading

## The logic of Reverse Mathematics

This post is about a research idea I have been thinking about which is quite different from my usual research. It’s an example of a project with an “old fashioned” feel to it, as if it could have been studied … Continue reading