Dr. Khristo Boyadzhiev
 2000  Present: Professor of Mathematics at ONU.
 1993 1999: Associate Professor of Mathematics at ONU.
 1990 1993: Assistant Professor of Mathematics at ONU.
 1990: Visiting Associate Professor of Mathematics for two quarters at Ohio University.
 1989: Senior Research Fellow at the Institute of Mathematics, Bulgarian Academy of Sciences, and the University of Sofia.
1981 Present: Reviewer for Mathematical Reviews.
1988 Present: Reviewer for Zentralblatt für Mathematik.
 My Google Site 
Department of Mathematics and Statistics  Seminar Organizer
 Ph.D. in Mathematics, University of Sofia, Bulgaria, 1978. Thesis: Order Characterization of Operator Algebras.
 M.S. in Mathematics, University of Sofia, Bulgaria, 1972. Thesis: The Spectral Theorem via Extreme Points.
Undergraduate and graduate courses in Calculus, Geometry, Linear Algebra, Differential Equations, Complex Variables, College Algebra and Trigonometry, Foundations of Mathematics, Real Analysis, Functional Analysis, Fourier Analysis and Partial Differential Equations.
 Mary Reichelderfer Chair of Mathematics and Computer Science for 19931994, 19941995, 19951996, 20062007, 20132014.
 Carl B. Allendoerfer Award for 2013 from The Mathematical Association of America
 Recognized as one of the Top 25 STEM professors in Ohio
 Badge of Honor, University of Sofia, 1972.
Classical Analysis. Theory of Series. Integral Transforms. Functional calculus for operators. Commutation relations. Trace formulas for commutators and differences of operators. Hyponormal operators. Operator and functional inequalities. Operator monotone functions. Semigroups of operators and the Abstract Cauchy Problem. Fractional powers and imaginary powers of operators. Order properties of operator algebras. Banach Jordan algebras.

Euler sums of hyperharmonic numbers (with Ayhan Dil), Journal of Number Theory, Volume 147 (2015), Pages 490–498.

Series with zeta values and infinite products. Integral Transforms and Special Functions 26 (2015), no. 3, 173–176.

Poisson's formula with principal value integrals and some special Gradshteyn and Ryzhik integrals, SCIENTIA. Series A: Mathematical Sciences, 25 (2014), 2737.

Power Series with Binomial Sums and Asymptotic Expansions, Int. Journal of Math. Analysis, Vol. 8 (2014), no. 28, 13891414.

Evaluation of series with binomial sums, Analysis Mathematica, 40 (1), (2014), 1323.

Binomial transform and the backward difference, Advances and Applications in Discrete Mathematics, 13 (1) (2014), 4363.

Power series with skewharmonic numbers, dilogarithms, and double integrals, Tatra Mountain Math. Publications, 56, (2013), 93–108.

Evaluation of one exotic Furdui type series, Far East Journal of Mathematical Sciences, Volume 75, Issue 2 (2013), 359  367.

The integrals in Gradshteyn and Ryzhik.Part 21: Hyperbolic functions (with Victor Moll), SCIENTIA: Series A: Mathematical Sciences, v. 22 (2012), 109127.

Close encounters with the Stirling numbers of the second kind, The Mathematics Magazine, 85, No. 4, (October 2012), 252266.

Series with Hermite polynomials and applications, (with Ayhan Dil ) Publicationes Mathematicae Debrecen, 80, Fasc. 34, (2012) 387406.

Series with Central Binomial Coefficients, Catalan Numbers, and Harmonic Numbers, Journal of Integer Sequences, v. 15 (2) 2012 ; 12.1.7

Series Transformation Formulas of Euler Type, Hadamard Product of Functions, and Harmonic Number Identities, Indian Journal of pure and Applied mathematics, 42 (2011), 371387.

The integrals in Gradshteyn and Ryzhik. Part 17, The Riemann Zeta Function (with Victor Moll) , SCIENTIA: Series A: Mathematical Sciences, v. 20 (2010), 6171.

Calculus, radio dials and the straightline frequency variable capacitors, “International Journal of Mathematical Education in Science and Technology”, Vol. 41, No. 5, 15 July 2010, 667–710.

The Euler Series Transformation and the Binomial Identities of Ljunggren, Munarini, and Simons, “INTEGERS”, 10 A22 (2010) 265271.

Exponential polynomials, Stirling numbers, and evaluation of some Gamma integrals, Abstract and Applied Analysis, Volume 2009, Article ID 168672 (electronic, open source).

Harmonic Number Identities Via Euler's Transform, J. Integer sequences, 12(6), (2009), Article 09.6.1 (electronic).

Alternating Euler sums at the negative integers (with H. Gopalkrishna Gadiyar, and R. Padma), HardyRamanujan Journal, 32(2009), 2437.

On the Taylor Coefficients of the Hurwitz Zeta Function, JP Journal of Algebra, Number Theory and Applications, 12(1) (2008), 1  127.

Derivative polynomials for Tanh, Tan, Sech and Sec in explicit form, Fibonacci Quarterly, 45.4 (2007), 291303.

The integrals in Gradshteyn and Ryzhik. Part 11: The incomplete beta function, arXiv.org, (2008)

Polyexponentials, arXiv.org, (2007)

The values of an Euler sum at the negative integers and a relation to a certain convolution of Bernoulli numbers (with H. Gopalkrishna Gadiyar, and R. Padma), Bulletin of the Korean Mathematical Society. Vol. 45, No. 2, (2008), 277283.

Evaluation of some simple Eulertype series, Far East Journal of Mathematical Sciences (FJMS),
Volume 29, Issue 1, Pages 1 11 (2008). 
ApostolBernoulli functions, derivative polynomials and Eulerian polynomials, Advances and Applications in Discrete Mathematics, Volume 1, Issue 2, Pages 109 122 (2008).

Equiangular surfaces, selfsimilar surfaces and the geometry of sea shells, College Mathematics Journal, 30, no. 4, (2007), 265271.

Evaluation of series with Hurwitz and Lerch zeta function coefficients by using Hankel contour integrals, Applied Mathematics and Computation, Vol 186/2, (2007),15591571.
 A note on Bernoulli polynomials and solitons, Journal of Nonlinear Mathematical Physics, 14 (2), (2007), 174 178
 A Series transformation formula and related polynomials, International Journal of Mathematics and Mathematical Sciences ,Vol. 2005 (2005), Issue 23, Pages 38493866
 Integral representation of functions on sectors, functional calculus and norm estimates, Collect. Math. 53,3 (2002), 287302.
 Consecutive evaluation of Euler sums, Internat. J. Math. Math. Sci., 29:9 (2002), 555561
 Evaluation of EulerZagier sums, Internat. J. Math. Math. Sci., 27:7 (2001) 407412.
 Krein's trace formula and spectral shift function, Internat. J. Math. Math. Sci., 25:4 (2001), 239252.
 A characteristic property of differentiation, American Mathematical Monthly, 106, no.4, (1999), 353355.
 Spirals and conchospirals in the flight of insects, College Mathematics Journal, 30, no.1, (1999), 2331.
 Norm estimates for commutators of operators, Journal of the London Mathematical Society, 57 (1998), 739745..
 Functional calculus for Hilbert space operators with bounded imaginary powers, ( in Interaction Between Functional Analysis, Harmonic Analysis, and Probability, ed. N. Kalton et al.). Lecture Notes in Pure and Appl. Math. v. 175 (1996), 97104.
 Strong stability of Hilbert space contraction semigroups, (With N.Levan), Studia Sci.Math.Hungarica 29(1994), 118.
 Logarithms and imaginary powers of operators on Hilbert space, Collectanea Mathematica, 45(1994), 287300.
 Spectral theorem for unbounded strongly continuous groups on Hilbert space,(With R.deLaubenfels) Proc.Amer.Math.Soc. 120(1994), 127136.
 Boundary values of holomorphic semigroups, (With R.deLaubenfels) Proc.Amer.Math.Soc. 118(1993), 113118.
 Generation of generators of holomorphic semigroups, (With C.Berg and R.deLaubenfels). J.Australian Math.Soc. 55(1993), 245269.
 Mean value theorems for traces, Mathematica Japonica 38(1993), 217224.
 Semigroups and resolvents of bounded variation, imaginary powers and H ^{inf }functional calculus, (With R.deLaubenfels) Semigroup Forum 45(1992), 372384.
 Introducing the equiangular spiral by using LOGO to model Nature,(With I.Boyadzhiev), J. of Computers in Math. and Math. Education 11(1992), 155162.
 Trace formula for commutators of unitary operators with rank one commutator, Proc.Amer.Math.Soc. 113(1991), 157162.
 H^{inf}functional calculus for perturbations of generators of holomorphic semigroups, (With R.deLaubenfels) Houston J.Math. 17(1991), 131147.
 Some inequalities for generalized commutators, Publ. RIMS, Kyoto Univ. 26(1990), 521527.
 Poisson integrals of the Pincus principal function for hyponormal operators, Review Roumaine Math.Pures et Appl. 34(1989), 197211.
 Sinclair type inequalities for the local spectral radius and related topics, Israel J.Math. 53(1987), 272284.
 An asymptotic Fuglede theorem for generators of Cogroups, Acta Math.Hungarica 49(1987), 145150.
 A manyvariable LandauKolmogorov inequality, Math.Proc.Cambridge Philos.Soc. 101(1987), 123129.
 Generalizations of the LandauHadamard inequality and inequalities for quadratic polynomials of operators, Proc.Roy.Soc.Edinburgh Sect. A, 102(1986), 123129.
 New applications of Bernstein's inequality to the theory of operators: A local Sinclair lemma and a generalization of the FugledePutnam theorem, Complex Analysis and Applications'85, Sofia, 1986, 97104.
 The Liouville Theorem. A Survey, Math. and Math. Education, Proc.15th Conf. Sunny Beach, Bulgaria, April 69, 1986, 2456.
 Commuting Cogroups and the FugledePutnam theorem, Studia Math. 81(1985), 303306.
 Commuting oneparameter groups of operators, operator and functional inequalities and the FugledePutnam theorem, C.R.Acad. Bulgare Sci. 38(1985), 1922.
 Characterization of the generators of Cosemigroups which leave a convex set invariant. Comment.Math.Univ.Carolinae25(1984),no.1, 158170.
 Linear operators satisfying a minimum principle. C.R.Acad.Bulgare Sci. 37(1984), 721724.
 A note on a paper of Watanabe (The boundedness of closed linear maps in C*algebras), Acta Sci.Math. (Szeged) 46(1983), 303304.
 A generalization of FugledePutnam's theorem, C.R.Acad.Bulgare Sci. 36(1983), 15031505.
 Some notes on numerical ranges and dissipative operators,C.R.Acad.Bulgare Sci. 36(1983), 13711374.
 An inequality for bounds of successive derivatives, Math.Student 50(1982), 214218.
 Unbounded generators of positive semigroups on B*algebras, C.R.Acad.Bulgare Sci. 35(1982), 10331036.
 Unbounded dissipative operators on Jordan Banach algebras and B*algebras, C.R.Acad.Bulgare Sci. 35(1982), 291293.
 Some notes on unbounded symmetric operators in Banach spaces, Annuare Univ.Sofia Fac.Math.Mech.,Livre 1, 75(1981), 1925.
 Alternators on Banach Jordan algebras,(with M.Youngson) C.R.Acad.Bulgare Sci. 33(1980), 15891590.
 Order characterization of some Banach Jordan algebras, C.R.Acad. Bulgare Sci. 32(1979), 10191021.
 Some notes on real Banach algebras, Serdica 5(1979), 307309.
 Partially ordered B*equivalent Banach algebras, Serdica 4 (1978), 1218.
 Characterization of B*equivalent Banach algebras by means of their positive cones, Serdica 3(1977), 2024.
 Commutativity in Banach algebras and elements with real spectrum, C.R.Acad.Bulgare Sci.29(1976), 14011403.
Tuesday: 8 a.m.4:30 p.m.
Wednesday: 8 a.m.4:30 p.m.
Thursday: 8 a.m.4:30 p.m.
Friday: 8 a.m.4:30 p.m.
Saturday: Closed
Sunday: Closed