Aleksandr Yakovlevich Khinchin (Russian: Алекса́ндр Я́ковлевич Хи́нчин , French: "Alexandre Khintchine" ; July 19, 1894 – November 18, 1959) was a Soviet mathematician and one of the most significant people in the Soviet school of probability theory.
In mathematics, the Khintchine inequality, named after Aleksandr Khinchin and spelled in multiple ways in the Roman alphabet, is a theorem from probability, and is also frequently used in analysis.
 Heuristically, it says that if we pick formula_1 complex numbers formula_2, and add them together each multiplied by a random sign formula_3, then the expected value of the sum's modulus, or the modulus it will be closest to on average, will be not too far off from formula_4.
In probability theory, the Palm–Khintchine theorem, the work of Conny Palm and Aleksandr Khinchin, expresses that a large number of not necessarily Poissonian renewal processes combined will have Poissonian properties.
Khinchin's theorem may refer to any of several different results by Aleksandr Khinchin:
In number theory, Aleksandr Yakovlevich Khinchin proved that for almost all real numbers "x", coefficients "a" of the continued fraction expansion of "x" have a finite geometric mean that is independent of the value of "x" and is known as Khinchin's constant.
Anatoly Alexeevitch Karatsuba (Russian: Анато́лий Алексе́евич Карацу́ба ; Grozny, Soviet Union, January 31, 1937 – Moscow, Russia, September 28, 2008) was a Russian mathematician working in the field of analytic number theory, "p"-adic numbers and Dirichlet series.
In applied mathematics, the Wiener–Khinchin theorem, also known as the Wiener–Khintchine theorem and sometimes as the Wiener–Khinchin–Einstein theorem or the Khinchin–Kolmogorov theorem, states that the autocorrelation function of a wide-sense-stationary random process has a spectral decomposition given by the power spectrum of that process.
In mathematics, the Khinchin integral (sometimes spelled Khintchine integral), also known as the Denjoy–Khinchin integral, generalized Denjoy integral or wide Denjoy integral, is one of a number of definitions of the integral of a function.
 It is a generalization of the Riemann and Lebesgue integrals.
 It is named after Aleksandr Khinchin and Arnaud Denjoy, but is not to be confused with the (narrow) Denjoy integral.
The Karatsuba algorithm is a fast multiplication algorithm.
 It was discovered by Anatoly Karatsuba in 1960 and published in 1962.
 It reduces the multiplication of two "n"-digit numbers to at most formula_1 single-digit multiplications in general (and exactly formula_2 when "n" is a power of 2).
 It is therefore faster than the classical algorithm, which requires "n" single-digit products.
 For example, the Karatsuba algorithm requires 3 = 59,049 single-digit multiplications to multiply two 1024-digit numbers ("n" = 1024 = 2), whereas the classical algorithm requires (2) = 1,048,576.
Aleksandr Grigoryevich Mazur (Russian: Александр Григорьевич Мазур , 30 August 1913 – 16 December 2005) was a heavyweight Greco-Roman wrestler from Ukraine who won a world title in 1955, aged 42.
 He retired the same year and between 1955 and 1990 coached wrestlers at his sports society CSKA Moscow.
 His trainees included Aleksandr Yurkevich, Anatoly Kolesov, Yury Kozin, Anatoly Kirov, Georgy Vershinin, Vladimir Novokhatko and Valery Anisimov.

Question: Did both Aleksandr Khinchin and Anatoly Karatsuba specialize in the same sub-field of mathematics?
Answer: no