Boole’s Rings- Partitioning a reflecting stationary set February 15, 2019 Assaf Rinot
- 4th Arctic Set Theory Workshop, January 2019 February 15, 2019 Assaf Rinot
- The Core Model Induction and Other Inner Model Theoretic Tools Rutgers - Tutorial: HOD Computations February 8, 2019 Sandra Müller
- Potentialism and implicit actualism in the foundations of mathematics, Jowett Society lecture, Oxford, February 2019 January 26, 2019 Joel David Hamkins
- Towards a general method for accessible content trees or: deep aria-labels for equations revisited January 13, 2019 Peter Krautzberger
- Comments on Boole’s Rings
- Comment on Math for nine-year-olds: fold, punch and cut for symmetry! by Joel David Hamkins February 8, 2019 Comments for Joel David Hamkins
- Comment on Inner-model reflection principles by Inner-model reflection principles | A kind of library February 2, 2019 Comments for Joel David Hamkins
- Comment on Math for nine-year-olds: fold, punch and cut for symmetry! by Joseph O'Rourke January 30, 2019 Comments for Joel David Hamkins
- Comment on Math for nine-year-olds: fold, punch and cut for symmetry! by 10 fun geometry ideas to share with kids – inspired by a Jordan Ellenberg tweet – Mike's Math Page January 25, 2019 Comments for Joel David Hamkins
- Comment on A remark on Schimmerling’s question by Ari Brodsky January 24, 2019 Comments for Assaf Rinot
Author Archives: Carl Mummert
Talk: Survey of mathematically applied computability theory
Despite being relatively small, my department has three faculty in finite combinatorics, in addition to having me in logic. I recently gave a series of two talks in our seminar to present a broad overview of classical computability theory, and … Continue reading
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Reverse Mathematics of Matroids
This post is about the paper Reverse Mathematics of Matroids by Jeff Hirst and me. We look at basis theorems for countable vector spaces, countable graphs, and countable enumerated matroids. These three kinds of structures turn out to be extremely … Continue reading
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An example with Dedekind cuts
In this post, I will briefly describe an example in computability theory that is well known, but not easy to find in the literature. It gives one reason why Dedekind cuts are difficult to work with computationally. Theorem. There is … Continue reading
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Talk on Reverse Mathematics and Ramsey Theory
This is a copy of my notes from a two-hour talk I gave at our local combinatorics seminar about Reverse Mathematics and Ramsey Theory. The audience consisted of our combinatorialists, who are not logicians, and so the talk is intended … Continue reading
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Talk on the existence of connected components of graphs
This week I am attending a seminar at Dagstuhl on Measuring the Complexity of Computational Content: Weihrauch Reducibility and Reverse Analysis. This post has slides from my talk and some blog-only remarks to expand on them.
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Filter quantifiers
I have been supervising an undergraduate student in an independent study in topology this semester. We have just finished the Stone–Čech compactification, and the semester is ending, so I want to end with an ultrafilter based proof of Hindman’s theorem. … Continue reading
Posted in Results worth knowing
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Talk on Reverse Mathematics and the Modal Logic of Reverse Mathematics
This is a transcription of notes from a talk I gave on November 1, 2013 to the interdisciplinary logic seminar at the University of Connecticut. I gave a general introduction to Reverse Mathematics and then spoke about my work with … Continue reading
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Internal combinatorics and uniform reducibility
This post is a set of notes from a talk I gave on December 5th for the discrete mathematics seminar at Marshall University. I want to argue that logical analysis can reveal the “internal combinatorics” of theorems, using some recent … Continue reading
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Quiz on public peer review
I have been required to complete a “responsible conduct of research” training module by the research office at my school. The reason I am commenting is that I was asked to answer the following question “true” or “false”. This is … Continue reading
Posted in Musings
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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