» Dr. Adrian Vajiac
Associate Professor

Schmid College of Science and Technology
Mathematics and Computer Science, School of Computational Sciences
Dr. Adrian Vajiac
University of Bucharest, Bachelor of Science
Boston University, Ph.D. in Mathematics

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 PDEs

In 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 Cauchy-Fueter, the Mosil-Theodorescu, 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 Theory

Topological 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 non-rigorous 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 Mathai--Quillen formalism in the context of Equivariant Cohomology, in order to study properties of TQFTs (e.g. Donaldson--Witten and Seiberg--Witten generating functions) and relations between them.

Foundations of Geometry

I 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 non-Euclidean geometries using purely geometric axioms, without using numbers, distances, and/or continuity properties.

Mathematics and Physics Education

My 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
"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 978-3-319-08770-2
"Complex Laplacian and Derivatives of Bicomplex Functions", M.E. Luna-Elizarraras, M. Shapiro, D.C. Struppa, A. Vajiac, Complex Anal. Oper. Theory, Springer Basel, p. 1-37, March (2013).
"The Cauchy-Kowalewski product for bicomplex holomorphic functions", H. De Bie, D.C. Struppa, A. Vajiac, M.B. Vajiac, Mathematische Nachrichten, Volume 285, Issue 10, p. 1230-1242, 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. 617-634, Birkh\auser (Springer) (2012).
"Bicomplex Numbers and their Elementary Functions", M.E. Luna-Elizarraras, M. Shapiro, D.C. Struppa, A. Vajiac, CUBO: A Mathematical Journal, vol.14, no.2, p.61-80, ISSN 0719-0646, (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. 265-283, (2012).
"Discovering Geometry: An Axiomatic Approach", W.G. Boskoff, A. Vajiac, Matrix Rom, Bucharest, 134 pp., ISBN: 78-973-755-668-4 (2011).
"Remarks on Holomorphicity in three settings: Complex, Quaternionic, and Bicomplex", D.C. Struppa, A. Vajiac, M.B. Vajiac, Hypercomplex Analysis and Applications, Trends in Mathematics, pg. 261-274, Birkauser Verlag Basel/Switzerland (2011).
"Bicomplex hyperfunctions", F. Colombo, I. Sabadini, D.C. Struppa, A. Vajiac, M.B. Vajiac, Ann. Mat. Pura Appl. (4) 190, no.2, pg. 247-261, (2011).
"Singularities of functions of one and several bicomplex variables", F. Colombo, I. Sabadini, D.C. Struppa, A. Vajiac, M.B. Vajiac, Arkiv for Matematik, Volume 49, Issue 2 (2011), pg. 277-294.
"Multicomplex hyperfunctions", A. Vajiac, M.B. Vajiac, Complex Variables and Elliptic Equations, Volume 57, Issue 7-8, p. 751-762, (2012).