# Posts

_{April 19, 2019}

### Set theory in second-order

_{April 11, 2019}

### Set theories with classes

_{April 11, 2019}

### Kelley-Morse set theory does not prove the class Fodor principle

_{April 11, 2019}

### A primer on the set-theoretic multiverse

_{February 09, 2019}

### A $\square(\kappa)$-like principle consistent with weak compactness

_{October 15, 2018}

### The Stable Core

_{September 11, 2018}

### The Stable Core

_{July 15, 2018}

### Virtual Vopěnka's Principle

_{May 20, 2018}

### Boolean-valued class forcing

_{May 01, 2018}

### Boolean-valued class forcing

_{March 21, 2018}

### Virtual large cardinal principles at KGRC

_{March 21, 2018}

### A model of second-order arithmetic satisfying AC but not DC

_{January 03, 2018}

### The emerging zoo of second-order set theories

_{October 12, 2017}

### Virtual large cardinal principles

_{September 27, 2017}

### Filter games and Ramsey-like cardinals

_{July 13, 2017}

### The exact strength of the class forcing theorem

_{March 14, 2017}

### Virtual large cardinals

_{March 06, 2017}

### Virtual Set Theory and Generic Vopěnka's Principle

_{January 20, 2017}

### A countable ordinal definable set of reals without ordinal definable elements

_{December 06, 2016}

### The oddities of class forcing

_{September 10, 2016}

### A set-theoretic approach to Scott's Problem

_{May 17, 2016}

### Generic Vopěnka's Principle at YST2016

_{April 19, 2016}

### Generic Vopěnka's Principle

_{March 29, 2016}

### Computable processes can produce arbitrary outputs in nonstandard models

_{February 25, 2016}

### Virtual large cardinals

_{February 10, 2016}

### Generic Vopěnka's Principle, remarkable cardinals, and the weak Proper Forcing Axiom

_{January 05, 2016}

### Set Theory Day to celebrate Joel David Hamkins' 50th birthday

_{October 23, 2015}

### Mitchell order for Ramsey and Ramsey-like cardinals

_{September 10, 2015}

### Open determinacy for class games

_{July 31, 2015}

### Ehrenfeucht principles in set theory

_{July 20, 2015}

### Indestructible remarkable cardinals

_{May 07, 2015}

### My first Black Board Day

_{April 22, 2015}

### An introduction to nonstandard models of arithmetic

_{February 19, 2015}

### Remarkable Laver functions

_{January 09, 2015}

### Ehrenfeucht's lemma in set theory

_{December 31, 2014}

### Kelley-Morse set theory and choice principles for classes

_{September 17, 2014}

### Indestructibility properties of remarkable cardinals

_{September 17, 2014}

### Incomparable $\omega_1$-like models of set theory

_{August 07, 2014}

### Co-organizing the CUNY Set Theory Seminar

_{July 30, 2014}

### Choice schemes for Kelley-Morse set theory

_{May 07, 2014}

### An absoluteness lemma for countable embeddings

_{March 17, 2014}

### Incomparable $\omega_1$-like models of set theory

_{March 01, 2014}

### Introduction to remarkable cardinals

_{February 24, 2014}

### Variants of Kelley-Morse set theory

_{January 29, 2014}

### Ramsey cardinals and the continuum function

_{November 13, 2013}

### A Jonsson $\omega_1$-like model of set theory

_{October 12, 2013}

### Forcing to add proper classes to a model of ${\rm GBC}$: The technicalities

_{October 09, 2013}

### Forcing to add proper classes to a model of ${\rm GBC}$: An introduction

_{October 01, 2013}

### Embeddings among $\omega_1$-like models of set theory

_{June 28, 2013}

### Large cardinal chart of Ramsey-like cardinals

_{June 25, 2013}

### On ground model definability

_{February 01, 2013}

### Mathematical Logic Course

_{September 03, 2012}

### Easton's theorem for Ramsey and strongly Ramsey cardinals

_{July 31, 2012}

### Who let the zombies out?

_{March 01, 2012}

### Indestructibility for Ramsey cardinals

_{January 18, 2012}

### An iPhone app for a nonstandard model of number theory?

_{December 09, 2011}

### What is the theory ZFC without power set?

_{November 10, 2011}

### Inner models with large cardinal features usually obtained by forcing

_{November 03, 2011}

### Forcing and gaps in $2^\omega$

_{October 21, 2011}

### Indestructibility for Ramsey and Ramsey-like cardinals

_{March 31, 2010}

### A natural model of the multiverse axioms

_{March 26, 2010}

### A natural model of the multiverse axioms

_{January 01, 2010}

### Gödel's Proof

_{July 31, 2009}

### Ramsey-like cardinals II

_{July 31, 2009}

### Ramsey-like cardinals

_{July 31, 2008}

### Proper and piecewise proper families of reals

_{June 01, 2008}