## William H. Barker

Isaac Henry Wing Professor of Mathematics

### Contact Information

barker@bowdoin.edu

207-725-3571

Mathematics

Searles Science Building - 105

### Teaching this semester

### MATH 1800. Multivariate Calculus, A

Multivariate calculus in two and three dimensions. Vectors and curves in two and three dimensions; partial and directional derivatives; the gradient; the chain rule in higher dimensions; double and triple integration; polar, cylindrical, and spherical coordinates; line integration; conservative vector fields; and Green’s theorem. An average of four to five hours of class meetings and computer laboratory sessions per week.

### MATH 2404. Geometry

A survey of modern approaches to Euclidean geometry in two dimensions. Axiomatic foundations of metric geometry. Transformational geometry: isometries and similarities. Klein’s Erlanger Programm. Symmetric figures. Other topics may be chosen from three-dimensional geometry, ornamental groups, area, volume, fractional dimension, and fractals.

### Teaching next semester

### MATH 2603. Introduction to Analysis

Building on the theoretical underpinnings of calculus, develops the rudiments of mathematical analysis. Concepts such as limits and convergence from calculus are made rigorous and extended to other contexts, such as spaces of functions. Specific topics include metric spaces, point-set topology, sequences and series, continuity, differentiability, the theory of Riemann integration, and functional approximation and convergence.

### MATH 3404. Projective and Non-Euclidean Geometries

A survey of affine, projective, and non-Euclidean geometries in two-dimensions, unified by the transformational viewpoint of Klein’s Erlanger Programm. Special focus placed on conic sections and projective embeddings. Additional topics as time permits: complex numbers in plane geometry, quaternions in three-dimensional geometry, and the geometry of four-dimensional space-time in special relativity. Mathematics 2404 is helpful but not required.

### Education

- A.B. Binghamton University
- Ph.D. Massachusetts Institute of Technology

### Research Interests

- Geometry, Lie Theory, Analysis

### Books, Reports, and Monographs

*Continuous Symmetry: From Euclid to Klein*

William Barker and Roger Howe

Supplemental Materials (Errata, Revisions, Course Resources)

Review of *Continuous Symmetry* from MAA Reviews.

*Curriculum Foundations Project: Voices of the Partner Disciplines*

The individual reports are available for downloading

*Harmonic Analysis on Reductive Groups*

Edited by William Barker and Paul Sally

*L ^{p} Harmonic Analysis on SL(2,R)*

Further information on this Memoir.