Mastering Partial Derivatives,
4/9/19,
Undergraduate Colloquium,
Department of Mathematics,
Pacific University,
Forest Grove, OR, USA
(with Corinne Manogue)
Using Active Engagement to Teach Mathematics,
11/7/18,
Séminaire Général,
Institut de Mathémathiques et de Sciences Physiques (IMSP),
Université d'Abomey-Calavi,
Porto-Novo, BÉNIN
Using Geometric Reasoning to Teach Vector Calculus,
3/15/17,
NIUS Workshop,
Homi Bhabha Centre for Science Education,
Mumbai, INDIA.
(with Corinne Manogue)
Putting differentials back into calculus,
10/7/15,
Math Chat,
Department of Mathematics,
Oregon State University, Corvallis, OR, USA.
OSU Honors College Panel,
9/24/12,
Colloquium, Department of Mathematics,
Oregon State University, Corvallis, OR, USA.
(with Bill Bogley, Toni Doolen, and Dennis Garity)
Fostering and Studying Complex Reasoning Capabilities,
4/27/12,
Colloquium, Center for Science Education,
Seoul National University, Seoul, KOREA.
Bridging the Gap Between Mathematics and the Physical Sciences,
4/19/12,
Mathematics Education Seminar, Department of Mathematical Sciences,
University of Northern Colorado, Greeley, CO, USA.
(with Corinne Manogue)
Octonions and E6,
4/14/10,
Physics Group Meeting,
School of Natural Sciences,
Institute for Advanced Study, Princeton, NJ, USA.
(with Corinne Manogue)
Bridging the Gap between Mathematics and the Physical Sciences,
1/26/10,
Department Seminar,
Department of Mathematics,
Bowdoin College, Brunswick, ME, USA.
Bridging the Gap between Mathematics and the Physical Sciences,
1/25/10,
Colloquium,
Center for Science and Mathematics Education Research,
University of Maine, Orono, ME, USA.
(with Corinne Manogue)
Bridging the Gap between Mathematics and the Physical Sciences,
12/1/09,
Colloquium,
Department of Mathematics,
Arizona State University, Tempe, AZ, USA.
Bridging the Gap between Mathematics and the Physical Sciences,
11/3/09,
Instructional Colloquium,
Department of Mathematics,
University of Arizona, Tucson, AZ, USA.
Bridging the Gap between Mathematics and the Physical Sciences,
9/4/09,
Colloquium,
Department of Mathematics,
Boise State University, Boise, ID, USA.
(with Corinne Manogue)
The Geometry of Special Relativity,
4/27/09,
Colloquium,
Department of Physics,
Oregon State University, Corvallis, OR, USA.
Octonions and Fermions,
4/17/09,
Colloquium,
Department of Physics,
California State University, Fresno, CA, USA.
Teaching Calculus Coherently,
3/4/09,
Brown Bag Lunch Seminar,
Department of Science and Mathematics Education,
Oregon State University, Corvallis, OR, USA.
Bridging the Vector Calculus Gap,
3/27/08,
Physics Education Seminar,
Department of Physics,
Kansas State University, Manhattan, KS, USA.
Bridging the Vector Calculus Gap,
3/26/08,
Special Math/Physics Lecture,
Department of Physics,
University of Oklahoma, Norman, OK, USA.
The Geometry of E6,
3/25/08,
Colloquium,
Department of Mathematics,
University of Arkansas, Fayetteville, AR, USA.
The Octonionic Eigenvalue Problem Revisited,
5/11/07,
Quantum Computation and Games Seminar,
Departments of Mathematical Sciences and Electrical and Computer Engineering,
Portland State University, Portland, OR, USA.
Using Technology to Visualize Derivatives of Vector Fields,
12/4/02,
Mathematics and Computer Science Seminar,
Grinnell College, Grinnell, IA, USA.
Bridging the Vector Calculus Gap,
11/19/02,
Mathematical Physics Seminar, Departments of Mathematics and Physics/Astronomy,
University of Iowa, Iowa City, IA, USA.
(with Corinne Manogue)
Octonions and Fermions,
11/19/02,
Mathematical Physics Seminar, Departments of Mathematics and Physics/Astronomy,
University of Iowa, Iowa City, IA, USA.
(with Corinne Manogue)
The Octonionic Eigenvalue Problem,
11/12/02,
Mathematics and Computer Science Seminar,
Grinnell College, Grinnell, IA, USA.
The Rotating Quantum Vacuum,
11/12/02,
Physics Seminar,
Grinnell College, Grinnell, IA, USA.
The Rotating Quantum Vacuum,
10/22/02,
Cosmology-Relativity-Geometry Seminar, Department of Physics and Astronomy,
University of Missouri, Columbia, MO, USA.
Octonions and Fermions,
10/21/02,
O. M. Stewart Colloquium, Department of Physics and Astronomy,
University of Missouri, Columbia, MO, USA.
Some Differences between Mathematics and Physics,
9/26/02,
Joint Math/CS and Physics Faculty Seminar,
Grinnell College, Grinnell, IA, USA.
(with Corinne Manogue)
Octonions and Fermions,
4/26/02,
High Energy/Nuclear Seminar, Department of Physics,
University of Massachusetts, Amherst, MA, USA.
(with Corinne Manogue)
The Geometry of the Octonions,
3/8/02,
Valley Geometry Seminar,
University of Massachusetts, Amherst, MA, USA.
Octonions and Fermions,
1/31/02,
Colloquium, Department of Physics,
Mount Holyoke College, South Hadley, MA, USA.
(with Corinne Manogue)
Using Technology to Visualize Derivatives of Vector Fields,
12/6/01,
Seminar, Department of Mathematics and Statistics,
Mount Holyoke College, South Hadley, MA, USA.
Bridging the Vector Calculus Gap,
10/9/01,
Math Pedagogy Seminar, Department of Mathematics,
Grinnell College, Grinnell, IA, USA.
(with Corinne Manogue)
Octonions and Spin,
10/9/01,
Physics Seminar, Department of Physics,
Grinnell College, Grinnell, IA, USA.
(with Corinne Manogue)
Octonions and Fermions,
7/25/01,
Colloquium, Department of Physics,
University of Cape Town, Cape Town, SOUTH AFRICA.
Octonions and Fermions,
7/24/01,
Colloquium, Department of Physics,
Universiteit Stellenbosch, Stellenbosch, SOUTH AFRICA.
Octonions and Fermions,
7/12/01,
Seminar, Cosmology Group, Department of Maths and Applied Maths,
University of Cape Town, Cape Town, SOUTH AFRICA.
Bridging the Vector Calculus Gap,
1/30/01,
Mathematics Education Seminar, Department of Mathematics,
Oregon State University, Corvallis, OR, USA.
Div, Grad, Curl -- Again,
4/13/00,
Colloquium, Department of Mathematics,
Reed College, Portland, OR, USA.
UNDER THE SPELL OF THE GAUGE PRINCIPLE: The 1999 Nobel Prize in Physics,
3/6/00,
Colloquium, Department of Physics,
Oregon State University, Corvallis, OR, USA.
The Octonionic Eigenvalue Problem,
7/16/99,
Special Seminar, Instituut-Lorentz for Theoretical Physics,
Universiteit Leiden, Leiden, THE NETHERLANDS.
The Octonionic Eigenvalue Problem,
7/12/99,
Joint ICTP/SISSA Mathematical Physics Seminar,
Scuola Internazionale Superiore di Studi Avanzati,
Trieste, ITALY.
Octonions and Fermions,
7/2/99,
Seminario Especial,
Departamento de Gravitación y Teoría de Campos,
Universidad Nacional Autonoma de México, Ciudad de México,
MEXICO.
Octonions and Fermions,
11/16/98,
Relativity Seminar, Department of Physics,
New York University, New York, NY, USA.
The Octonionic Eigenvalue Problem,
4/20/98,
Colloquium, Department of Mathematical Sciences,
Portland State University, Portland, OR, USA.
The Octonionic Eigenvalue Problem,
10/16/97,
Colloquium, Department of Mathematics,
Reed College, Portland, OR, USA.
The Octonionic Eigenvalue Problem,
11/19/96,
Colloquium, Department of Mathematics,
Oregon State University, Corvallis, OR, USA.
When Do Rotating Detectors Respond?,
11/12/96,
General Relativity Theory Seminar, Department of Physics,
University of Maryland, College Park, MD, USA.
Signature Change,
1/30/96,
Colloquium, Department of Mathematics,
Oregon State University, Corvallis, OR, USA.
Rotating Observers in Relativity,
12/22/95,
Perspectives in Emerging Physics (PEP) talk,
Inter-University Centre for Astronomy and Astrophysics (IUCAA),
Pune, INDIA.
Geometry, Relativity, and all that,
11/30/95,
Graduate Student Colloquium, Department of Mathematics
Oregon State University, Corvallis, OR, USA.
When Do Rotating Detectors Respond?,
7/27/95,
Departmental Seminar, Department of Physics and Mathematical Physics,
University of Adelaide, Adelaide, AUSTRALIA.
Classical Signature Change in General Relativity,
7/21/95,
General Relativity Seminar, Department of Mathematics,
Monash University, Melbourne, AUSTRALIA.
Classical Signature Change in General Relativity,
7/14/95,
Department of Applied Mathematics,
University of Sydney, Sydney, AUSTRALIA.
Classical Signature Change,
7/11/95,
Institute for Advanced Studies,
Australian National University, Canberra, AUSTRALIA.
Spinors without Spinors,
6/9/95,
Mathematical and Theoretical Physics Seminar,
Department of Physics and Mathematical Physics,
University of Adelaide, Adelaide, AUSTRALIA.
Classical Signature Change in General Relativity,
3/10/95,
Mathematical and Theoretical Physics Seminar,
Department of Physics and Mathematical Physics,
University of Adelaide, Adelaide, AUSTRALIA.
Classical Signature Change in General Relativity,
11/30/94,
London Relativity Seminar, School of Mathematical Sciences,
Queen Mary and Westfield College, London, ENGLAND.
Classical Signature Change in General Relativity,
11/22/94,
Mathematical Physics Seminar, Department of Physics,
University of Newcastle upon Tyne, Newcastle, ENGLAND.
Classical Signature Change in General Relativity,
10/24/94,
Mitarbeiterseminar, Institut für Theoretische Physik,
Universität zu Köln,
Köln, GERMANY.
Spinors without Spinors,
10/20/94,
Seminar, Max-Planck-Institut für Astrophysik,
Garching bei München, GERMANY.
Classical Signature Change in General Relativity,
10/18/94,
Seminar, Max-Planck-Institut für Astrophysik,
Garching bei München, GERMANY.
Div, Grad, Curl, and all that -- even Spinors!,
4/21/94,
Colloquium, Department of Mathematics,
Reed College, Portland, OR, USA.
Classifying Spacetimes in Theory and
Practice,
2/23/94,
Colloquium,
Department of Computer Science,
Oregon State University, Corvallis, OR, USA.
The Scalar Field Equation in the Presence of Signature Change,
8/27/93,
Seminar, Department of Mathematical Sciences,
University of Aberdeen,
Aberdeen, SCOTLAND.
Particle Production from Signature Change,
7/21/92,
Seminário, Departamento de Relatividade e Partículas,
Centro Brasileiro de Pesquisas Físicas (CBPF),
Rio de Janeiro, BRAZIL.
Particle Production from Signature Change,
7/7/92,
Ciclo de Conferencias "COSMOLOGIA",
Grupo de Teorias Cuanticas Relativistas y Gravitacion,
Istituto de Astronomía y Física del Espacio (IAFE),
Buenos Aires, ARGENTINA.
The Unusual Geometry of Special Relativity,
4/29/92,
Joint Mathematics and Physics Colloquium,
Lewis & Clark College, Portland, OR, USA.
Classifying Spacetimes in Theory and Practice,
4/5/91,
Area III Seminar,
Mathematical Sciences Research Institute,
Berkeley, CA, USA.
Gluing Spacetimes Together,
8/2/90,
Seminaria Physikoy, Department of Physics,
University of Crete, Iraklion, GREECE.
Global Structure,
7/19/90,
Invited Talk,
Sxoleio Proxoremenes Physikes Irakleioy,
Department of Physics,
University of Crete, Iraklion, GREECE.
Bouncing Shells,
7/12/90,
Mathematical Physics Seminar, Faculty of Mathematical Studies,
University of Southampton, Southampton, ENGLAND.
Relativistic Shock Waves: The Laser Wars,
4/16/90,
Colloquium, Department of Physics,
Oregon State University, Corvallis, OR, USA.
Classifying Spacetimes in Theory and Practice,
3/13/90,
Mathematical Physics Seminar, Department of Mathematics,
Texas A & M University, College Station, TX, USA.
Classifying Spacetimes in Theory and Practice,
1/23/90,
Applied Mathematics Seminar, Department of Mathematics,
University of Alberta, Edmonton, CANADA.
Classifying Spacetimes in Theory and
Practice,
10/24/89,
Colloquium, Department of Mathematics,
Oregon State University, Corvallis, OR, USA.
Algebraic Computing in General Relativity,
9/22/89,
General Relativity and Gravitation Applications Seminar,
National Center for Supercomputing Applications, University of Illinois,
Urbana, IL, USA.
Scalar Field Quantization in Rotating Spacetimes,
5/24/89,
Nuclear and Particle Physics Seminar, Department of Physics,
Oregon State University, Corvallis, OR, USA.
1. Duality and Conformal Structure & 2. Parametric Manifolds,
8/18/88,
Astrophysics Seminar,
Tata Institute of Fundamental Research, Bombay, INDIA.
Parametric Manifolds,
8/1/88,
Journal Club,
Raman Research Institute, Bangalore, INDIA.
Hawking Radiation Made Easy,
7/26/88,
Colloquium,
Raman Research Institute, Bangalore, INDIA.
The Trousers Topology,
6/20/88
Mathematical Physics Seminar, Faculty of Mathematical Studies,
University of Southampton, Southampton, ENGLAND.
DO BLACK HOLES EXPLODE? An Introduction to Hawking Radiation
PART I: Accelerating Observers,
5/20/88,
PART II: Hawking Radiation,
5/27/88,
Nuclear and Particle Physics Seminar, Department of Physics,
Oregon State University, Corvallis, OR, USA.
Shock Waves in General Relativity,
11/5/87,
Seminar, Department of Mathematics,
University of Poona, Pune, INDIA.
Matter at the Horizon of the Schwarzschild Black Hole,
10/16/87,
Astrophysics Seminar,
Tata Institute of Fundamental Research, Bombay, INDIA.
An Introduction to Particle Creation in Curved Space,
8/31/87,
Particle Creation as seen by Accelerating Observers,
9/2/87,
Hawking Radiation,
9/7/87,
Particle Creation in Expanding Universes,
9/9/87,
Lecture Series,
Institute of Mathematical Sciences, Madras, INDIA.
Matter at the Horizon of the Schwarzschild Black Hole,
8/7/87,
Colloquium,
Raman Research Institute, Bangalore, INDIA.
Asymptotic Structure in General Relativity,
3/31/87,
Colloquium, Department of Mathematics,
Oregon State University, Corvallis, OR, USA.
Asymptotic Structure in General Relativity,
3/19/87,
Colloquium, Department of Mathematical Sciences,
Portland State University, Portland, OR, USA.
Asymptotic Structure in General Relativity,
3/10/87,
Colloquium, Department of Mathematics and Statistics,
Southern Illinois University, Carbondale, IL, USA.
Matter at the Horizon of the Schwarzschild Black Hole,
3/5/87,
Relativity Seminar, Department of Physics,
University of Texas, Austin, TX, USA.
Matter at the Horizon of the Schwarzschild Black Hole,
3/4/87,
Seminar, Department of Mathematics,
University of Texas, Arlington, TX, USA.
Asymptotic Structure in General Relativity,
3/2/87,
Colloquium, Department of Mathematics,
University of Missouri, Columbia, MO, USA.
Matter at the Horizon of the Schwarzschild Black Hole,
11/11/86,
Mathematical Physics Seminar, Mathematical Institute,
University of Oxford, Oxford, ENGLAND.
Shock Waves in General Relativity,
11/7/86,
Theoretical Physics Seminar, Department of Mathematical Sciences,
University of Durham, Durham, ENGLAND.
Matter at the Horizon of the Schwarzschild Black Hole,
5/8/86,
Relativity and Geometry Seminar, Faculty of Mathematical Studies,
University of Southampton, Southampton, ENGLAND.
Matter at the Horizon of the Schwarzschild Black Hole,
5/7/86,
London Relativity Seminar, School of Mathematical Sciences,
Queen Mary College, London, ENGLAND.
Colliding Plane Waves,
3/14/86,
Relativity Seminar, Department of Mathematics,
University of York, York, ENGLAND.
Matter at the Horizon of the Schwarzschild Black Hole,
2/27/86,
Theoretical Physics Seminar, School of Physics,
University of Newcastle upon Tyne, Newcastle, ENGLAND.
Matter at the Horizon of the Schwarzschild Black Hole,
12/16/85,
Astrophysics Seminar, Department of Physics,
University of Florida, Gainesville, FL, USA.
Shock Waves in General Relativity,
12/13/85,
Valley Geometry Seminar,
Amherst College, Amherst, MA, USA.
Matter at the Horizon of the Schwarzschild Black Hole,
12/5/85,
Special Talk, Department of Mathematics,
University of Alberta, Edmonton, CANADA.
Matter at the Horizon of the Schwarzschild Black Hole,
11/28/85,
Séminaire de physique théorique,
Laboratoire de Physique Théorique,
Institut Henri Poincaré, Paris, FRANCE.
Matter at the Horizon of the Schwarzschild Black Hole,
11/14/85,
Vortrag, Institut für Theoretische Physik,
Universität Wien, Wien, AUSTRIA.
Matter at the Horizon of the Schwarzschild Black Hole,
10/23/85,
Seminar, Max-Planck-Institut für Astrophysik,
Garching bei München, WEST GERMANY.
Matter at the Horizon of the Schwarzschild Black Hole,
10/10/85,
Seminarium Theoretische Fysica, Instituut voor Theoretische Fysica,
Universiteit van Amsterdam, Amsterdam, THE NETHERLANDS.
Matter at the Horizon of the Schwarzschild Black Hole,
10/8/85,
Quantum Gravity -- General Relativity Seminar,
Institut für Theoretische Physik,
Universität Zürich, Zürich, SWITZERLAND.
Matter at the Horizon of the Schwarzschild Black Hole,
10/3/85,
Seminario, Dipartimento di Fisica,
Università degli Studi di Milano, Milano, ITALY.
Matter at the Horizon of the Schwarzschild Black Hole,
9/11/85,
Seminarium Theoretische Natuurkunde, Instituut voor Theoretische Fysica,
Rijksuniversiteit Utrecht, Utrecht, THE NETHERLANDS.
Matter at the Horizon of the Schwarzschild Black Hole,
2/25/85,
Institute for Theoretical Physics -- Brookhaven National Lab Joint Seminar,
SUNY, Stony Brook, NY, USA
Matter at the Horizon of the Schwarzschild Black Hole,
12/5/84,
General Relativity Seminar, Department of Physics and Astronomy,
University of Maryland, College Park, MD, USA
Generalized Spherical Harmonics, with examples from
relativity and monopole physics,
11/19/84,
Members' Seminar, School of Mathematics,
Institute for Advanced Study, Princeton, NJ, USA.
Matter at the Horizon of the Schwarzschild Black Hole,
11/16/84,
Relativity Seminar, Enrico Fermi Institute,
University of Chicago, Chicago, IL, USA.
Matter at the Horizon of the Schwarzschild Black Hole,
10/31/84,
Talks on Quantum Gravity, School of Natural Sciences,
Institute for Advanced Study, Princeton, NJ, USA.
Distribution-valued Curvature, with examples from relativity,
10/24/84,
Mathematical Physics Seminar, School of Mathematics,
Institute for Advanced Study, Princeton, NJ, USA.
The Gravitational Shock Wave of a Massless Particle,
8/17/84,
Colloquium Theoretische Hoge-Energiefysica,
NIKHEF, Amsterdam, THE NETHERLANDS.
Gravitational Shock Waves,
7/13/84,
Seminarium Theoretische Natuurkunde, Instituut voor Theoretische Fysica,
Rijksuniversiteit Utrecht, Utrecht, THE NETHERLANDS.
Particle Definitions in Curved Space-Times,
5/21/84,
An Introduction to Hawking Raditaion,
5/25/84,
Lectures on Quantum Gravity,
NIKHEF, Amsterdam, THE NETHERLANDS.
Particle Definitions in Robertson-Walker Space-Times,
5/16/84,
Seminarium Theoretische Natuurkunde, Instituut voor Theoretische Fysica,
Rijksuniversiteit Utrecht, Utrecht, THE NETHERLANDS.
Teilchendefinitionen in Robertson-Walker Raumzeiten,
4/22/83,
Oberseminar über aktuelle Fragen der Feldtheorie,
Universität Freiburg, Freiburg, WEST GERMANY.
The Asymptotic Structure of Some Exact, Radiating Solutions of the
Einstein-Maxwell Equations,
3/31/83,
Seminarium, Instytut Fizyki Teoretycznej,
Uniwersytet Warszawski, Warszawa, POLAND.
Normal Forms, Finite Energy, and Adiabatic Particle
Definitions for Gravitational and Electromagnetic Fields,
1/18/83,
Seminar des Forschungsgebietschwerpunktes,
Institut für Theorie der Elementarteilchen,
Freie Universität Berlin, Berlin, WEST GERMANY.
On Defining Particles in Robertson-Walker Space-Times,
10/1/82,
Relativity Seminar, Enrico Fermi Institute,
University of Chicago, Chicago, IL, USA.