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Dr. Adrian I. Vajiac
Associate Professor
 Office Location:
 Von Neumann Hall 103
 Phone:
 7149976898
 Email:
 avajiac@chapman.edu
 Website:
 http://www1.chapman.edu/~avajiac
 Education
 University of Bucharest, Bachelor of Science
Boston University, Ph.D. in Mathematics
 Biography
Research Interests:Complex and Hypercomplex Analysis
Complex Analysis is a classical branch of mathematics, having its roots in late 18th and early 19th centuries, which investigates functions of one and several complex variables. It has applications in many branches of mathematics, including Number Theory and Applied Mathematics, as well as in physics, including Hydrodynamics, Thermodynamics, Electrical Engineering, and Quantum Physics.
Clifford Analysis is the study of Dirac and Dirac type operators in Analysis and Geometry, together with their applications. In 3 and 4 dimensions Clifford Analysis is referred to as Quaternionic Analysis. Furthermore, methods and tools of Clifford Analysis are extended to the field of Hypercomplex Analysis.
Algebraic Computational Methods in Geometric and Physics PDEsIn recent years, techniques from computational algebra have become important to render effective general results in the theory of Partial Differential Equations. My research is following the work of D.C. Struppa, I. Sabadini, F. Colombo, F. Sommen, etc., authors which have shown how these tools can be used to discover and identify important properties of several systems of interest, such as the CauchyFueter, the MosilTheodorescu, the Maxwell, the Proca system, as well as the systems which naturally arise from the work of the Belgian school of Brackx, Delanghe and Sommen.
Equivariant Localization Techniques in Topological Quantum Field TheoryTopological Quantum Field Theories (TQFT) emerged in the late 1980s as part of the renewed relationship between differential geometry/topology and physics. In the 1990s, developments in TQFT gave unexpected results in differential topology and symplectic and algebraic geometry. One striking feature of physicists' approach to TQFT is the use of mathematically nonrigorous Feynman path integrals to produce new topological invariants of manifolds, which appear as the physical observables of the TQFT. My work makes use of the MathaiQuillen formalism in the context of Equivariant Cohomology, in order to study properties of TQFTs (e.g. DonaldsonWitten and SeibergWitten generating functions) and relations between them.
Foundations of GeometryI am interested mostly in the Hilbertian axiomatic approach to Geometry. Far from being an expert in this field, I am studying especially the constructions of Euclidean and nonEuclidean geometries using purely geometric axioms, without using numbers, distances, and/or continuity properties.
Mathematics and Physics EducationMy interests lie in methodological aspects of introducing research ideas and modern results in Mathematics and Physics to undergraduate students and future teachers. My goal is to raise scientific awareness and interest among college and university students, and to prepare them for active research.
 Recent Creative, Scholarly Work and Publications

"Script Geometry", P. Cerejeiras, U. Kahler, F. Sommen, A. Vajiac, Ordered Structures and Applications: Positivity VII, Trends in Mathematics, pp. 79–110, 2016, Springer International Publishing

"A zeta function for multicomplex algebra", A. Sebbar, D.C. Struppa, M.B. Vajiac, A. Vajiac, Publ. RIMS Kyoto Univ., 2016

"Bicomplex Holomorphic Functions. The Algebra, Geometry and Analysis of Bicomplex Numbers", LunaElizarrarás, M.E., Shapiro, M., Struppa, D.C., Vajiac, A., Birkhauser, Frontiers in Mathematics, 2015, ISBN 9783319248684

"Differential Equations in Multicomplex Spaces", D.C. Struppa, A. Vajiac, M.B. Vajiac, in Hypercomplex Analysis: New Perspectives and Applications, Series: Trends in Mathematics, Bernstein, S., Kähler, U., Sabadini, I., Sommen, F. (Eds.), 2014, VIII, 228 p. 2 illus. A product of Birkhäuser Basel, ISBN 9783319087702

"Complex Laplacian and Derivatives of Bicomplex Functions", M.E. LunaElizarraras, M. Shapiro, D.C. Struppa, A. Vajiac, Complex Anal. Oper. Theory, Springer Basel, p. 137, March (2013).

"The CauchyKowalewski product for bicomplex holomorphic functions", H. De Bie, D.C. Struppa, A. Vajiac, M.B. Vajiac, Mathematische Nachrichten, Volume 285, Issue 10, p. 12301242, July (2012).

"Holomorphy in Multicomplex Spaces", D.C Struppa, A. Vajiac, M.B. Vajiac, Spectral Theory, Mathematical System Theory, Evolution Equations, Differential and Difference Equations, Volume 221, ISBN 9783034802970, p. 617634, Birkh\auser (Springer) (2012).

"Bicomplex Numbers and their Elementary Functions", M.E. LunaElizarraras, M. Shapiro, D.C. Struppa, A. Vajiac, CUBO: A Mathematical Journal, vol.14, no.2, p.6180, ISSN 07190646, (2012).

"Hyperbolic Numbers and their Functions", M. Shapiro, D.C. Struppa, A. Vajiac, M.B. Vajiac, Analele Universitatii Oradea, Fasc. Matematica, Tom XIX, Issue No. 1, p. 265283, (2012).