Question: Between Sergei Novikov and Anatoly Karatsuba, who won the Fields Medal in 1970?

Context paragraphs:
Anton Zorich: Anton V. Zorich (in Russian: "Антон Владимирович Зорич"; born 3 September 1962) is a Russian mathematician at the "Institut Mathématiques de Jussieu".  He received his Ph.D. from Moscow State University under the supervision of Sergei Novikov.

Karatsuba algorithm: 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.

William Browder (mathematician): William Browder (born January 6, 1934) is an American mathematician, specializing in algebraic topology, differential topology and differential geometry.  Browder was one of the pioneers with Sergei Novikov, Dennis Sullivan and Terry Wall of the surgery theory method for classifying high-dimensional manifolds.

Novikov's compact leaf theorem: In mathematics, Novikov's compact leaf theorem, named after Sergei Novikov, states that

Novikov conjecture: The Novikov conjecture is one of the most important unsolved problems in topology.  It is named for Sergei Novikov who originally posed the conjecture in 1965.

Wess–Zumino–Witten model: In theoretical physics and mathematics, a Wess–Zumino–Witten (WZW) model, also called a Wess–Zumino–Novikov–Witten model, is a type of two-dimensional conformal field theory named after Julius Wess, Bruno Zumino, Sergei Novikov and Edward Witten.

Anatoly Karatsuba: 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.

Sergei Novikov (mathematician): Sergei Petrovich Novikov (also Serguei) (Russian: Серге́й Петро́вич Но́виков) (born 20 March 1938) is a Soviet and Russian mathematician, noted for work in both algebraic topology and soliton theory.  In 1970, he won the Fields Medal.

Normal invariant: In mathematics, a normal map is a concept in geometric topology due to William Browder which is of fundamental importance in surgery theory.  Given a Poincaré complex "X" (more geometrically a Poincaré space), a normal map on "X" endows the space, roughly speaking, with some of the homotopy-theoretic global structure of a closed manifold.  In particular, "X" has a good candidate for a stable normal bundle and a Thom collapse map, which is equivalent to there being a map from a manifold "M" to "X" matching the fundamental classes and preserving normal bundle information.  If the dimension of "X" is formula_1 5 there is then only the algebraic topology surgery obstruction due to C. T. C. Wall to "X" actually being homotopy equivalent to a closed manifold.  Normal maps also apply to the study of the uniqueness of manifold structures within a homotopy type, which was pioneered by Sergei Novikov.

Independent University of Moscow: The Independent University of Moscow (IUM) (Russian: Независимый Московский Университет (НМУ) ) is a small educational organisation with rather informal status located in Moscow, Russia.  It was founded in 1991 by a group of prominent Russian mathematicians that included Vladimir Arnold (chairman) and Sergei Novikov.  The IUM consists of the departments of mathematics and theoretical physics and the post-graduate school.  Anyone can attend lectures and seminars and become a student after passing three exams.  The IUM is the only non-state college for the preparation of professional mathematicians in Russia .  An IUM diploma is recognized by such authoritative mathematical institutions as the Steklov Institute of Mathematics, Harvard University and the Weizmann Institute.

Supporting paragraphs: Sergei Novikov (mathematician) Anatoly Karatsuba
Answer: Sergei Petrovich Novikov