1964 Topological structures of the propositional calculus. Lecture sponsored by the Philosophy Colloquium, with Sidney Axinn. Temple University, Philadelphia, Pennsylvania, March 6.
1966a A new symbolism for the logic of sentences. Presented to the Philosophy Club, with Derek Thomsett. Acadia University, Nova Scotia, Canada, March 18.
1966b The trinomial theorem and triangular coordinates as applied to Sheldon's somatotypical tripology. Presented at the annual meeting of the Canadian Psychological Association. Montreal, June 1-3. [See Draft 1984]
1967 The Logic Alphabet. Faculty Colloquium, with Gilbert R. Fischer. Purdue University Calumet Campus (PUCC). Hammond, Indiana, March 10, April 7, and April 14. Handout.
1975 Alternate notations for the propositional calculus. Prepared for a Seminar at the School of Engineering, Biological Computer Laboratory, with Heinz Von Foerster. University of Illinois, Urbana, Illinois, October 10. Handout.
1977 About and about: The Logic Alphabet. Topic: Symbol systems, conventions, and rule-governed behavior. N E H Summer Seminar, with Richard S. Rudner. Washington University, Saint Louis, Missouri. Three Handouts.
1978a Flipstick logic. Presented to a class enrolled in college logic, with Nelson Pole. Cleveland State University, Ohio, February 22. Handout.
1978b Sign-creation and man-sign engineering. Presented at the annual meeting of the Semiotic Society of America. Providence, Rhode Island, October 6. Handout. [See Publication 1982b].
1979 A logical garnet as both a 3-D and a 4-D symmetry model of the 16 binary connectives. In Program Abstracts, Sixth International Congress of Logic, Methodology, and Philosophy of Science, Section 13, 205-209. Hannover, Germany, August 22. Handout.
1980 Designing signs that build the required semantics into the needed syntax. Presented at the annual meeting of the Semiotic Society of America, Texas Tech University, Lubbock, Texas, October 17. Handout.
1982 Classroom inventions for the Logic Alphabet. Presented at the annual meeting of the Semiotic Society of America. Buffalo, New York, October 23. Handout. [See Publication 1987a].
1983a More about the Logic Alphabet. Center of Psychosocial Studies, with Milton Singer and Louis Kauffman. Chicago, Illinois, June 30. Handout.
1983b Peirce's notations for the 16 binary connectives. At the conference on: The birth of mathematical logic: Nineteenth century logic from Boole to Schroeder. Randall R. Dipert and John Corcoran (organizers), Department of Philosophy, State University of New York, Fredonia, March 16-18. Handout.
1985 Logic and sign creation: Catching up with Peirce (1902) and going beyond what he did (1985). Charles Darwin Society, with Myrdene Anderson. Purdue University, West Lafayette, Indiana, October 11. Handout.
1987a Sensorimotor toys that work for Piaget's formal operations. Topic: Tools and toys: Human implementation in evolutionary and cross-cultural perspective. Symposium Abstracts for the annual meeting of the American Association for the Advancement of Science, p. 59. Chicago, Illinois, February 16. Handout.
1987b Peirce, Piaget, and actions-objects-symbols for the propositional calculus. Topic: Tools and toys: Representation. Presented at the annual meeting of TASP: The Association for the Anthropological Study of Play, Montreal, March 27. Handout.
1987c Notation, relational iconicity, and rethinking the propositional calculus. In Program Abstracts, Eighth International Congress of Logic, Methodology, and Philosophy of Science 1, 376-379. Moscow, USSR, August 17-22. Handout.
1988a Symmetry, binary logic, and the game of flip-mate-flip. In Denes Nagy (organizer and editor), Symmetry in a Cultural Context 2: An Interdisciplinary Workshop, 17-21. Arizona State University, March 18-20.
1988b Sign-factors-engineered symbols for logic. In Program Abstracts, An International Conference Celebrating the 50th Anniversary of the Founding of the Institute of General Semantics, 25-26. Yale University, July 27-31.
1989a Symmetry and the crystallography of logic. In Program Abstracts, Denes Nagy and Gyorgy Darvis (editors), Symmetry of Structure: Interdisciplinary Symmetry Symposia 1I, 641-644. Budapest, Hungary, August 13-19. Handout
1989b Untapped potential in Peirce's iconic notation for the sixteen binary connectives. Presented at the Charles S. Peirce Sesquicentennial International Congress. Harvard University, September 5-10. Handout. [See Publication 1997a]
1990 A Peircian approach to sign-building in logic. Charles Darwin Society, with Myrdene Anderson. Purdue University, January 29. Handout: The Logic Alphabet: Tables and diagrams.
1991 Comparative analysis of notations for the propositional calculus. Workshop for classes in education, philosophy, and engineering. Sponsored by Theodore Messenger at the University of North Dakota, Grand Forks, North Dakota, April 18-20.
1992a Cards, mirrors, and hand-held models that lead into elementary logic. Presented at the Sixteenth Annual Conference of the International Group for the Psychology of Mathematics Education (North American Chapter), University of New Hampshire, August 7-11. Handout.
1992b Semeiotics, good symmetry, and the logic of propositions. In Gyorgy Darvis and Denes Nagy (editors), Symmetry: Culture & Science (Special Issue), 76-77. Hiroshima, Japan, August, 17-24.
1992c Symmetry models that lead into elementary logic. In Gyorgy Darvis and Denes Nagy (editors), Symmetry: Culture & Science (Special Issue), 78-79. Hiroshima, Japan, August, 17-24.
1993a Symmetry, mirrors, and symbolic logic. Faculty Colloquium, Mount Union College, Alliance, Ohio, April 21. Lots of overheads.
1993b Extended Library Exhibit of the Models for the Logic Alphabet. Mount Union College, Alliance, Ohio. Summer 1993. Photographs.
1994 On a deep correspondence between sign-creation in logic and symmetry in crystallography. At the Fifth Congress of the International Association for Semiotic Studies, Berkeley, California, June 12-18. [See Publications 1997b].
1995 A symmetry notation that coactivates the common ground between symbolic logic and crystallography. In Gyorgy Darvis and Denes Nagy (editors), Symmetry: Natural and Artificial, 556-559. Third Congress of the International Society for the Interdisciplinary Study of Symmetry, Washington, D.C., August 14-20. Handout.
1996 Sign creation, logic, and group theory. In coordination with the 85th Birthday Celebration for Heinz Von Foerster by the Institute Vienna Circle, November 13-14. Institute for Advanced Studies, Vienna, November 12. 1997 A personal record of how creativity in sign-factors engineering led to the Logic Alphabet. Presented at the annual meeting of the Semiotic Society of America, Louisville, Kentucky, October 23-26. Lots of overheads. 1998a Let the mirros do the thinking.. Conference for Bridges: Mathematical Connections in Art, Music, and Science. Coordinated by Reza Sarhangi, Department of Mathematics, Southwestern College, Winfield, Kansas, July 28. Lots of overheads. [See Publications 1998].
1998b Notation, square truth tables, and an introduction to mirror logic. Department of Mathematics and Computing, with Adam Vile. South Bank University, London, September 22. Lots of overheads.
1998c Symmetry groups, relational polyhedra, and a much better notation for the propositional calculus. The Mathematics Department, Kings College, London, September 24. 1999a Elementary logic: A lesson in constructing a shape-value notation. The Department of Mathematics, with Adalira Saenz-Ludlow. University of North Carolina at Charlotte, March 5. Lots of overheads.
1999b Introduction to the Logic Alphabet. For students and teachers of mathematics at a public school. Sponsored by Anna Marovich, Vicksburg Community Schools, Vicksburg, Michigan, March 17.
2000 Symmetry and the importance of a shape value notation. Geometry Conference: Recent trends in geometry and symmetry. A conference in honor of Donald W. Crowe, University of Wisconsin, May 7. 2003 Iconic Logic and Geometry (Roman Numeral I and Roman Numeral II). Dynamic Geometry and Algebraic Physics INTERDISCPLINARY CONFERENCE ON PHYSICS, ART, AND MATHEMATICS with Louis H. Kauffman. University of Illinois at Chicago, March 31-April 4.