John Sarli

John Sarli is a mathematician and academic. He is a Professor Emeritus of mathematics at California State University at San Bernardino.

Sarli's research focuses on the geometry of groups of Lie type and the applications of hyperbolic geometry

Career Sarli was Chair of the Department of Mathematics at California State University, San Bernardino from 1988 to 1994. In 1999, he joined the Mathematics Diagnostic Testing Project (MDTP) Workgroup. The following year, he took on the role of site director at CSU San Bernardino when an MDTP site was set up there. He assumed the position of Chair of the MDTP Workgroup in 2002 and held the role until 2020. He holds the title of professor emeritus of Mathematics at California State University, San Bernardino.

Research Sarli, through his research, described an incidence structure for twisted groups 𝐺, where points are elementary abelian root subgroups establishing a correspondence between certain lines and planes in this structure, demonstrating that it induces a polarity on an embedded metasymplectic space. He showed that biharmonic functions, crucial for understanding equilibrium equations for elastic bodies, can be derived from a power series using matrix representations of 𝐶 and applied to describe solutions to planar equilibrium equations within Möbius plane geometry. His alignment of the geometry of root subgroups in 𝐺=PSp4(𝑞) with a system of conics in the associated generalized quadrangle provided an interpretation of symplectic 2-transvections. Classifying the intrinsic conics in the hyperbolic plane, using collineation invariants, he offered metric characterizations and highlighted a natural duality among these classes, induced by an involution related to complementary angles of parallelism.

Selected articles Sarli, J. (1988). The geometry of root subgroups in Ree groups of type 2 F 4. Geometriae Dedicata, 26(1), 1-28. https://doi.org/10.1007/BF00148014 Sarli, J., & Torner, J. (1993). Representations of , biharmonic vector fields, and the equilibrium equation of planar elasticity. Journal of Elasticity, 32(3), 223–241. https://doi.org/10.1007/BF0013166 Sarli, J., & McClurg, P. (2001). McClurg, P. (2001). A rank 3 tangent complex of 𝑃Sp4(𝑞), 𝑞 odd. Advances in Geometry, 1(4), 365–371. https://doi.org/10.1515/advg.2001.022 Sarli, J. (2012). Conics in the hyperbolic plane intrinsic to the collineation group. Journal of Geometry, 103, 131–148. https://doi.org/10.1007/s00022-012-0115-5