singularities in the theory of ordinary differential equations, dynamical systems, differential geometry, calculus of variations, and optimal control. Recently, the main theme of the work is singularities of geodesic flows in pseudo-Riemannian spaces with signature varying metrics. In particular, it was established that geodesic lines cannot pass through degenerate points of the metric in arbitrary tangential directions, but only in certain admissible directions. Generically, in 2-dimensional case, the number of admissible directions is finite and varies from one to three, but if the dimension is more than two, the number of admissible directions can be finite or infinite. A brief survey in the two-dimensional case is presented in: https://arxiv.org/pdf/1801.09815.pdf
Main publications:
A.O. Remizov, “Geodesics on 2-surfaces with pseudo-Riemannian metric: singularities of changes of signature”, Sb. Math., 200:3 (2009), 385–403
I.R. Shafarevich, A.O. Remizov, Linear Algebra and Geometry, Springer-Verlag Berlin and Heidelberg GmbH, 2013 (English)
R. Ghezzi, A.O. Remizov, “On a class of vector fields with discontinuities of divide-by-zero type and its applications to geodesics in singular metrics”, J. Dyn. Control Syst., 18:1 (2012), 135–158
A.O. Remizov, “On the local and global properties of geodesics in pseudo-Riemannian metrics”, Differential Geometry and its Applications, 39 (2015), 36–58
A.O. Remizov, F. Tari, “Singularities of the geodesic flow on surfaces with pseudo-Riemannian metrics”, Geometriae Dedicata, 185:1 (2016), 131–153
I. R. Shafarevich, A. O. Remizov, Linear Algebra and Geometry, Springer, Heidelberg, 2013 , xxii+526 pp., Translated from the 2009 Russian original by David Kramer and Lena Nekludova, "Springer"
U. Boscain, R. A. Chertovskih, J. P. Gauthier, A. O. Remizov, “Hypoelliptic diffusion and human vision: a semidiscrete new twist”, SIAM J. Imaging Sci., 7:2 (2014), 669–698
A. O. Remizov, “Multidimensional Poincare Construction and Singularities of Lifted Fields For Implicit Differential Equations”, Journal of Mathematical Sciences, 151:6 (2008), 3561–3602
4.
U. Boscain, R. A. Chertovskih, J. P. Gauthier, D. Prandi, A. O. Remizov, “Highly Corrupted Image Inpainting Through Hypoelliptic Diffusion”, J. Math. Imaging Vis., 60:8 (2018), 1231–1245
A. O. Remizov, “Geodesics on 2-surfaces with pseudo-Riemannian metric: singularities of changes of signature”, Sb. Math., 200:3 (2009), 385–403
6.
A. O. Remizov, “Implicit differential equations and vector fields with non-isolated singular points”, Sb. Math., 193:11 (2002), 1671–1690
7.
U. Boscain, J. P. Gauthier, D. Prandi, A. O. Remizov, “Image Reconstruction Via Non-Isotropic Diffusion in Dubins/Reed-Shepp-like Control Systems”, 53-rd IEEE Conference on Decision and Control (Los Angeles, USA, 15-17 Dec. 2014), Proceedings of the IEEE Conference on Decision and Control, 2015, 4278–4283
R. Ghezzi, A. O. Remizov, “On a class of vector fields with discontinuities of divide-by-zero type and its applications to geodesics in singular metrics”, J. Dyn. Control Syst., 18:1 (2012), 135–158
A. O. Remizov, “Singularities of a geodesic flow on surfaces with a cuspidal edge”, Proc. Steklov Inst. Math., 268 (2010), 248–257
12.
N. G. Pavlova, A. O. Remizov, “Geodesics on hypersurfaces in Minkowski space: singularities of signature change”, Russian Math. Surveys, 66:6 (2011), 1201–1203
13.
N. G. Pavlova, A. O. Remizov, “Completion of the classification of generic singularities of geodesic flows in two classes of metrics”, Izv. Math., 83:1 (2019), 104–123
14.
U. Boscain, R. A. Chertovskih, J. P. Gauthier, D. Prandi, A. O. Remizov, “Cortical-inspired image reconstruction via sub-Riemannian geometry and hypoelliptic diffusion”, ESAIM, Proc. Surv., 64 (2018), 37–53
N. G. Pavlova, A. O. Remizov, “A brief survey on singularities of geodesic flows in smooth signature changing metrics on 2-surfaces”, Advances in Singularities and Foliations: Geometry, Topology and Applications (Salvador, Brazil, 2015), Springer Proc. in Math. & Stat., 222, Springer, 2018, 135–155
N. G. Pavlova, A. O. Remizov, “A complete classification of generic singularities of geodesic flows on 2-surfaces with pseudo-Riemannian metrics”, Russian Math. Surveys, 72:3 (2017), 577–579
22.
A. O. Remizov, “Geodesics in generalized Finsler spaces: singularities in dimension two”, J. Singularities, 14:1 (2016), 172–193
V. M. Zakalyukin, A. O. Remizov, “Legendre Singularities in Systems of Implicit ODEs and Slow–Fast Dynamical Systems”, Proc. Steklov Inst. Math., 261 (2008), 136–148
24.
A. O. Remizov, “Improper Singular Points of Corank 1 of Systems of Differential Equations Not Solved for the Derivatives”, Differ. Equ., 38:8 (2002), 1122–1131
25.
N. G. Pavlova, A. O. Remizov, “Hyperbolic Roussarie fields with degenerate quadratic part”, Russian Math. Surveys, 76:2 (2021), 366–368
26.
A. O. Remizov, “Generic singular points of implicit differential equations”, Mosc. Univ. Math. Bull., 57:5 (2002), 9–15
27.
A. O. Remizov, “Singularities of quasi-linear differential equations”, Dal'nevost. Mat. Zh., 23:1 (2023), 85–105
28.
A. O. Remizov, “Los caprichos diferenciales. A series of plots about differential equations”, Math. Ed., 2023, no. 1(105), 32–47
29.
A. O. Remizov, “On isomorphisms of pseudo-Euclid spaces”, Math. Ed., 2018, no. 2(86), 15–39
30.
N. G. Pavlova, A. O. Remizov, “On isomorphisms of pseudo-Euclidean spaces with signature (p,n-p) for p = 2,3”, Linear Algebra Appl., 541 (2018), 60–80
31.
I. R. Shafarevich, A. O. Remizov, Linear Algebra and Geometry, 2nd edition, IKI Edition, Izhevsk, 2014 , 554 pp. "Mathesis"
32.
R. A. Chertovskih, A. O. Remizov, “On pleated singular points of first-order implicit differential equations”, J. Dyn. Control Syst., 20:2 (2014), 197–206
33.
I. R. Shafarevich, A. O. Remizov, Linear Algebra and Geometry, 1st edition, eds. A. S. Kuleshov, Fizmatlit, Moscow, 2009 , 511 pp. "Fizmatlit"
34.
A. O. Remizov, “Singularities in three-dimensional affine control systems with scalar control”, Russian Math. Surveys, 62:4 (2007), 821–822
35.
A. O. Remizov, “On vector fields generated by implicit differential equations”, J. Math. Sci., 126:6 (2005), 1643–1653
36.
A. O. Remizov, “Vector fields with nonisolated singular points”, Dokl. Math., 65:3 (2002), 437–439
37.
A. O. Remizov, “Error estimate for an approximate solution of an ODE system which is not solved with respect to the derivatives”, Mosc. Univ. Comput. Math. Cybern., 2001, no. 2, 30–37
38.
A. O. Remizov, “To the centenary of I.R. Shafarevich”, Math. Ed., 2023, no. 4(108), 2–9
39.
N. G. Pavlova, A. O. Remizov, Introduction to Singularity Theory, MIPT, Moscow, 2022 , 181 pp. "Researchgate"
40.
N. G. Pavlova, A. O. Remizov, “Correction to the article “Smooth functions, formal series and Whitney theorems ””, Math. Ed., 2020, no. 1(93), 69
41.
N. G. Pavlova, A. O. Remizov, “Smooth functions, formal series, Whitney theorems, finished”, Math. Ed., 2017, no. 3(83), 13–27
42.
N. G. Pavlova, A. O. Remizov, “Smooth Functions, Formal Series, and Whitney Theorems”, Math. Ed., 2016, no. 3(79), 49–65