In mathematics, the Lyapunov time is the characteristic timescale on which a dynamical system is chaotic.
 It is named after the Russian mathematician Aleksandr Lyapunov.
 It is defined as the inverse of a system's largest Lyapunov exponent.
In applied mathematics and dynamical system theory, Lyapunov vectors, named after Aleksandr Lyapunov, describe characteristic expanding and contracting directions of a dynamical system.
 They have been used in predictability analysis and as initial perturbations for ensemble forecasting in numerical weather prediction.
 In modern practice they are often replaced by bred vectors for this purpose.
The Lyapunov–Malkin theorem (named for Aleksandr Lyapunov and ) is a mathematical theorem detailing nonlinear stability of systems.
In mathematics, the Lyapunov–Schmidt reduction or Lyapunov–Schmidt construction is used to study solutions to nonlinear equations in the case when the implicit function theorem does not work.
 It permits the reduction of infinite-dimensional equations in Banach spaces to finite-dimensional equations.
 It is named after Aleksandr Lyapunov and Erhard Schmidt.
In the theory of ordinary differential equations (ODEs), Lyapunov functions are scalar functions that may be used to prove the stability of an equilibrium of an ODE.
 Named after the Russian mathematician Aleksandr Mikhailovich Lyapunov, Lyapunov functions (also called the Lyapunov’s second method for stability) are important to stability theory of dynamical systems and control theory.
 A similar concept appears in the theory of general state space Markov chains, usually under the name Foster–Lyapunov functions.
In mathematics, the Kontsevich quantization formula describes how to construct a generalized ★-product operator algebra from a given arbitrary Poisson manifold.
 This operator algebra amounts to the deformation quantization of the corresponding Poisson algebra.
 It is due to Maxim Kontsevich.
Aleksandr Mikhailovich Lyapunov (Russian: Алекса́ндр Миха́йлович Ляпуно́в , ] ; June 6 [O.S. May 25] 1857 – November 3, 1918) was a Russian mathematician, mechanician and physicist.
 His surname is sometimes romanized as Ljapunov, Liapunov, Liapounoff or Ljapunow.
 He was the son of astronomer Mikhail Lyapunov and the brother of pianist and composer Sergei Lyapunov.
Lyapunov is a lunar crater named for Aleksandr Lyapunov that is located along the east-northeastern limb of the Moon, and is viewed from the side by observers on Earth.
 The eastern rim of this crater just falls into the section of the Moon called the far side, and visibility of this formation is affected by libration.
In the mathematical theory of knots, the Kontsevich invariant, also known as the Kontsevich integral of an oriented framed link, is a universal Vassiliev invariant in the sense that any coefficient of the Kontsevich invariant is of a finite type, and conversely any finite type invariant can be presented as a linear combination of such coefficients.
 It was defined by Maxim Kontsevich.
Maxim Lvovich Kontsevich (Russian: Макси́м Льво́вич Конце́вич ;   ; born 25 August 1964) is a Russian and French mathematician.
 He is a professor at the Institut des Hautes Études Scientifiques and a distinguished professor at the University of Miami.
 He received the Henri Poincaré Prize in 1997, the Fields Medal in 1998, the Crafoord Prize in 2008, the Shaw Prize and Fundamental Physics Prize in 2012, and the Breakthrough Prize in Mathematics in 2014.

Question: Were Maxim Kontsevich and Aleksandr Lyapunov both mathematicians?
Answer: yes