# Announcements

### City Geometry Seminar

24 February 2020**Topic:** “On degenerate Bianchi transformation for three-dimensional pseudospheric submanifolds in IR 5.”

prof. **V. Gorkavyy**

**02.24.2020 at 15-20, in the auditorium 6-49 **

### City Geometry Seminar

17 February 2020**Topic:** “Simple closed geodesics on regular tetrahedra in spherical space”

**D. Sukhorebskaya** (in collaboration with A.A. Borisenko)

**02.17.2020** at **15-20,** in the auditorium** 6-49 **

### City Geometry Seminar

10 February 2020**Topic:** “Simple closed geodesics on regular tetrahedra in spherical space”

**D. Sukhorebskaya** (in collaboration with A.A. Borisenko)

**02.10.2020** at **15-20,** in the auditorium** 6-49 **

### Kharkiv Geometry Seminar (with B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine)

12 December 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday,** 17****.12****.2018**

The talk "The cylindricity of full submanifolds in the Minkowski space" by O.A. Borisenko will be presented.

### Kharkiv Geometric Seminar

24 October 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday,** 29****.10****.2018**

The talk:"Geometry of foliations of polynomial growth with finite topology of leaves on 3-manifolds" by D. V. Bolotov will be presented.

### Kharkiv Geometric Seminar

16 October 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday,** 22****.10****.2018**

The talk "Infinitesimal deformations of surfaces with prescribed variation of the Riemannian connection" by Ihor Volodymyrovych Potapenko (I.I. Mechnikov Odesa National University, department of differential equations, geometry, and topology) will be presented.

### Kharkiv Geometric Seminar

2 October 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday,** 08****.10****.2018**

The talk "Full clasification of simple close geodesices on the regular tetrahedra in hyperbolic space" by A.A. Borisenko and D.D. Sukhorebskaya will be presented.

### Kharkiv Geometric Seminar

27 September 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday,** 01****.10****.2018**

The talk "Generalized curvature and related themes" by D.D. Sukhorebskaya will be presented.

### Kharkiv Geometric Seminar

21 September 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday,** 24****.09****.2018**

The talk "On an integral inequality for closed curves" by V.O. Gorkaviy will be presented.

### Kharkiv Geometric Seminar

17 September 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday,** 17****.09****.2018**

The talk "Geometry of special diffeomorphisms of locally conformally Kähler manifolds (based on the PhD thesis)" by Ye.V. Cherevko (Odesa National Economic University) will be presented.

### Kharkiv Geometric Seminar

14 May 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday,** 21****.05****.2018**

The talk "On catacaustics of hypersurfaces in the Euclidean space" by O.L. Yampolskiy will be presented.

### Kharkiv Geometric Seminar

18 April 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday,** 23****.04****.2018**

The talk "On convex polyhedra whose faces are not regular but whose net allows a normal tessellation into regular polygons" by O.M. Gurin will be presented.

### Kharkiv Geometric Seminar

10 April 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday,** 16****.04****.2018**

The talk "On foliations of nonnegative curvature on closed three-dimensional manifolds" by D. V. Bolotov

### Kharkiv Geometric Seminar

15 March 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, **19****.03****.2018**

The talk "Topology of singular foliations on surfaces" by Ye.O. Polulyakh (Institute of Mathematics of NAS of Ukraine, Kyiv) will be presented.

### Kharkiv Geometric Seminar

27 February 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, **05****.03****.2018**

### Kharkiv Geometric Seminar

21 February 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, **26****.02****.2018**

The talk "The Riemann-Hilbert problem and non-linear integral equations" by D.G. Shepelsky will be presented.

### Kharkiv Geometric Seminar

12 February 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, **19****.02****.2018**

The talk "Probabilistic and statistical problems on groups" by G.M. Feldman will be presented.

### Kharkiv Geometric Seminar

12 February 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, **05.02****.2018**

### Kharkiv Geometric Seminar

24 January 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, **29****.01.2018**

The talk "Closed geodesics on regular tetrahedra in the Lobachevsky space" by O.A. Borisenko and D.D. Sukhorebska will be presented.

### Kharkiv Geometric Seminar

15 January 2018The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, **22.01.2018**

The talk "Automorphisms of foliations on two-dimensional non-compact surfaces" by Yu. Soroka (Taras Shevchenko Kyiv National University) will be presented.

### 11 December 2017

The meeting of Kharkiv Mathematical Society dedicated to the 150th anniversary of D.M. Sintsov will be held on December 19 at 15-15 in the A.V. Pogorelov Auditorium (room 6-49) of V.N. Karazin Kharkiv National University. The agenda includes two talks:

"The life of D.M. Sintsov" by O.A. Borisenko;

"Contact geometry of compact manifolds" by D.V. Bolotov.

### Kharkiv Geometric Seminar

21 September 2017The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, **25.09.2017**

The talk "On gravitational waves II" by Yu.A. Aminov will be presented. The talk is dedicated to the memory of V.I. Denisov.

### Kharkiv Geometric Seminar

13 September 2017The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, **18.09.2017**

The talk "On gravitational waves I" by Yu.A. Aminov will be presented.

### Kharkiv Geometric Seminar

13 September 2017The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, **11.09.2017**

The talk "Diffeomorphisms of conformally Kähler manifolds" by Ye.V. Cherevko (Odesa National Economical University) will be presented.

### Kharkiv Geometric Seminar

6 March 2017The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, **13.03.2017**

Will the report of the **M. Grechneva** (Zaporizhzhya National University) ** «Differential geometry of surfaces of Minkowski space and its Grassmann image»**.

### Kharkiv Geometric Seminar

7 February 2017The next meeting of the Kharkiv Geometric Seminar (Head – Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, 13.02.2017.

Will the report of the B. Feshenko (Institute of Mathematics, National Academy of Sciences of Ukraine, Kiev) «Deformation of smooth functions on a 2-torus».

### Kharkiv Geometric Seminar

7 November 2016The next meeting of the Kharkiv Geometric Seminar (Head - Corresponding Member of NAS of Ukraine, Prof. A. Borisenko) will be held on Monday, 07.11.16.

Will the report of the professor D. Bolotov «Layer analogue of Milnor's conjecture»