Ralph Freese

Ralph Freese
Department of Mathematics
University of Hawaii
Honolulu, HI 96822
E-mail: ralph (at) math (dot) hawaii (dot) edu

Volumes II and III of ALVIN are now available!!!

Universal Algebra Calculator: This free program is capable of doing numerous things in Universal Algebra. including lattice drawing, Maltsev conditions, etc. It has its own website:
- uacalc.org

Lattice Drawing Program: I have a java component for drawing lattices and ordered sets. There are some demos and sample applictions.
- Lattice drawing

My talk at BLAST2024, UNT, Denton, April 4, 2024. Slides 14 and 15 give diagrams showing how to construct the Haiman lattices used to prove non-finite basis results.
My talk on New Old Results. Slides, video and abstract available at this (Panglobal Seminar) site.
My talk with Ralph McKenzie, George McNulty and Walter Taylor on Algebras Lattices Varieties, Volumes 1-N. Slides, video and abstract available at this (Panglobal Seminar) site.
My talk on Linear Mal'tsev Conditions. Video available at La Trobe GAIA Seminar Page, Sept 24/25, 2020.
My talk on embedding modular lattices in congruence lattices, JMM2020, Jan 13, 2020.
My talk on Representations of Lattices as Congruence Lattices of Finite Algebras, at BLAST 2017, Vanderbilt University Aug 14-18, 2017.

My talk on Projective Lattices, with applications to isotone maps and databases, at CLA 2013, La Rochelle, France Oct 15-18, 2013.
My talk on the use and implementation of the Universal Algebra Calculator, at the first Conference/Workshop on Computational Universal Algebra, University of Louisville, Oct 4, 2013.
My talk on Maltsev products of congruence permutable varieties, at the Louisville AMS Meeting, Oct 5-6, 2013.
My talk on Maltsev Conditions, at the Lattice Theory and Universal Algebra Meeting honoring Bela Csakany, Szeged, June 21-26, 2012.
My talk on semidistributivity and n-permutability, at the Honolulu AMS Meeting, Mar 3-4, 2012.
My talk on Algorithm and the Universal Algebra Calculator, at the JardaFest Meeting, Jun 21-25, 2010.
My talk on Maltsev Conditions (joint with Matt Valeriote) at the Nashville Conference June 11-16, 2007.
My talk on Congruence Varieties at the Gratzer Schmidt 70th Birthday Party, Budapest, June 6-9, 2006.
My talk on computing TCT types in \( O(n^3) \) time, at the Universal Algebra and Lattice Theory Congerence, Szeged, July 4-8, 2005.

Sperner's Lemma, a general talk.
A pdf of Calculus Concepts Using Derive, by Ralph Freese and David Stegenga. This contains several pedagogically interesting calculus labs.
Apply linear transformations to gifs and jpegs, a java servlet illustrating some concepts from linear algebra.