### Ha Tien Ngoan

Associate Professor, Doctor
Cộng tác viên
Nonlinear partial differential equations |

**Address**

Office: Building A5, Room 306

Tel: +84 (02)4 38361121 / 506

Email: htngoan AT math.ac.vn

Born in Nam Dinh in 1951*Education and academic degrees*:

1974: 1974, Moscow Russia

1978: PhD, Moscow Russia

1991: Associate Professor*Research areas*:

- Averaging PDEs whose coefficients depend on parameters,
- First-order PDEs,
- Hyperbolic and elliptic Monge-Ampere equations.

PUBLICATIONS

*List of publications in MathSciNet*

*List of recent publications*1 | Ha Tien Ngoan, Thai Thi Kim Chung, Elliptic Solutions to Nonsymmetric Monge-Ampère Type Equations II. A Priori Estimates and the Dirichlet Problem, Acta Mathematica Vietnamica, 44 (2019), pp 723–749, Scopus. |

2 | Ha Tien Ngoan, Thai Thi Kim Chung, Elliptic Solutions to Nonsymmetric Monge-Ampère Type Equations I: the d-Concavity and the Comparison Principle, Acta Mathematica Vietnamica, 44 (2019) pp 469–491, Scpous. |

3 | Nguyen Van Ngoc, Ha Tien Ngoan, Nguyen Thi Ngan, Solvability of Some Classes of Systems of Dual Integral Equations Involving Fourier Transforms, Acta Mathematica Vietnamica, 40 (2015), 653-669,Scopus. |

4 | Ha Tien Ngoan, Nguyen Huy Hoang, The Wronskian solutions of a nonlinear evolution equation. Interactions between real and complex analysis, 369–407, Sci. Technics Publ. House, Hanoi, 2012. |

5 | Ha Tien Ngoan, Nguyen Van Ngoc, Pseudo-differential operators related to Halkel transforms and application to dual integral equations, In: Algebraic Structures in Partial Differential Equations Related to Complex and Clifford Analysis, Ho Chi Minh City University of Education Press (2010), 249 -- 271. |

6 | Ha Tien Ngoan, N. H. Hoang, The Wronskian solutions of the Sine-Gordon equation, In: Algebraic Structures in Partial Differential Equations Related to Complex and Clifford Analysis, Ho Chi Minh City University of Education Press (2010) 171 -- 208. |

7 | Ha Tien Ngoan, On characteristic systems for general multidimensional Monge-Ampere equations, Acta Mathematica Vietnamica 36 (2011), 330 -- 344, Scopus. |

8 | Ha Tien Ngoan, The Wronskian solutions of the modified Korteweg-de Vries, Acta Mathematica Vietnamica36, 555 -- 583, Scopus. |

9 | Ha Tien Ngoan, Nguyen Huy Hoang, On Wronskian solutions of the quadratic Sine-Gordon equation, In: Proceedings of the 4th International Conference on Research and Education in Mathematics, Kuala Lumpur Oct. 21-23 (2009), 12-19. |

10 | Ha Tien Ngoan, N. T. Nga, On the Cauchy problem for a quasilinear weakly hyperbolic system in two variables and applications to that for weakly hyperbolic classical Monge-Ampốre equations. In: Advances in deterministic and stochastic analysis, 177--196, World Sci. Publ., Hackensack, NJ, 2007. |

11 | Ha Tien Ngoan, Nguyen Thi Nga, On the hyperbolicity of some systems of nonlinear first-order partial differential equations, Vietnam J. Math. 34 (2006), 109 - 128. |

12 | Ha Tien Ngoan, Nguyen Thi Nga, On the Cauchy problem for multidimentional Monge-Ampere equation, Acta Math. Vietnam. 29 (2004), 281 - 298. |

13 | Ha Tien Ngoan, N. T. Nga, On cauchy problem for hyperbolic Monge-Ampere equations. Journal of Science, Hanoi University of Education, Series Natural Sciences, 2002, N0 4, 3 - 10. |

14 | Nguyen Minh Chuong, Ha Tien Ngoan, Nguyen Minh Tri, L. Q. Trung, Partial differential equations (in Vietnamese) – Phương trình đạo hàm riêng. NXB Giáo dục, Hà Nội, 2000, 331 trang. |

15 | Ha Tien Ngoan, N. T. Nga, On cauchy problem for hyperbolic Monge-Ampere equations. In: Proceeding of the conference on partial differential Equations, Hanoi, December 27-29, 1999, 77 - 91. |

16 | Ha Tien Ngoan, Dexing Kong; Mikio Tsuji, Integration of Monge-Ampère equations and surfaces with negative Gaussian curvature. Annali della Scuola Normale Superiore di Pisa, Scienze Fis. e Math., Serie 4, 27 (1998), 309 - 330. |

17 | Ha Tien Ngoan, Hopf's formula for Lipschitz solutions of Hamilton-Jacobi equations with concave-convex Hamiltonian. Acta Math. Vietnam. 23 (1998), 269 - 293. |

18 | Ha Tien Ngoan, M. Tsuji, Integration of hyperbolic Monge-Ampère equations. In: Proceeding of Fifth Vietnamese Mathematical Conference, Hanoi, September 17 - 20, 1997, 205 - 212. |

19 | Ha Tien Ngoan, A family of solutions for the problems of plane flow. Acta Math. Vietnam. 13 (1988), 97 - 104. |

20 | Ha Tien Ngoan, Condition d’existence du produit de deux distributions, Acta Math. Vietnam. 10 (1985), 252 - 262. |

21 | Ha Tien Ngoan, C. Bardos, P. Degon, Existence globale des solutions des equations de Vlasov-Poisson relativistes en dimention 3. Comptes Rendus Acad. Sci. Paris, Série I 301 (1985), 265 - 268. |

22 | Ha Tien Ngoan, A necessary condition of hypoellipticity for the second order degenerate equations with the characteristic form of variable sign. Ukrain. Math. J. 35 (1983), 333 - 141 (in Russian). |

23 | Ha Tien Ngoan, V. V. Jikov, S. M. Kozlov, O. A. Oleinik, Averaging and G-convergence for differential operators. Uspekhi Math. Nauk (USSR), 34 (1979), 65 - 133 (in Russian). |

24 | Ha Tien Ngoan, On the everaging problem for linear elliptic equations and systems with coefficients depending on a parameter. Ph. D. Thesis, Moscow State University, 1978, 117 pp. (in Russian). |

25 | Ha Tien Ngoan, On the convergence of solutions of the boundary value problem for a sequence of elliptic systems. Vestnik of Moscow University, Ser. Math. and Mechanics, (1977), 83 - 92 (in Russian). |

26 | Ha Tien Ngoan, On the convergence of solutions of the boundary value problem for a sequence of elliptic equations. Uspekhi Math. Nauk (USSR), 32 (1977), 183 - 184 (in Russian). |

### Highlights

06/12/19, Conference: School “INVERSE PROBLEMS” |

06/12/19, Conference: Hội nghị Đại số-Lý thuyết số-Hình học và Tô pô 2019 |

09/12/19, Conference: Workshop Quốc tế về Hình học và Tổ hợp |

13/12/19, Colloquium Lecture: How to escape the curse of dimensionality in combinatorics |

20/12/19, Colloquium Lecture: Algebraic surfaces with minimal Betti numbers |

26/12/19, Conference: Hội thảo "Khía cạnh tất định và ngẫu nhiên của hệ động lực" |

17/02/20, Conference: SEAMS school “Arithmetic, Geometry and Model Theory” |

04/03/20, Conference: MIS-IMH research school on Mathematics of Data |

25/07/20, Conference: AMC-2020 Satellite Workshop Arithmetic of automorphic forms and their function field analogues |

25/07/20, Conference: AMC-2020 Satellite Workshop Minimal Free Resolution and Related Topics |