Oscar Zariski

Oscar Zariski (April 24, 1899 – July 4, 1986) was an American mathematician. The Russian-born scientist was one of the most influential algebraic geometers of the 20th century.

Education

Zariski was born Oscher (also transliterated as Ascher or Osher) Zaritsky to a Jewish family (his parents were Bezalel Zaritsky and Hanna Tennenbaum) and in 1918 studied at the University of Kyiv. He left Kyiv in 1920 to study at the University of Rome where he became a disciple of the Italian school of algebraic geometry, studying with Guido Castelnuovo, Federigo Enriques and Francesco Severi.

Zariski wrote a doctoral dissertation in 1924 on a topic in Galois theory, which was proposed to him by Castelnuovo. At the time of his dissertation publication, he changed his name to Oscar Zariski.

Johns Hopkins University years

Zariski emigrated to the United States in 1927 supported by Solomon Lefschetz. He had a position at Johns Hopkins University where he became professor in 1937. During this period, he wrote ''Algebraic Surfaces'' as a summation of the work of the Italian school.
The book was published in 1935 and reissued 36 years later, with detailed notes by Zariski's students that illustrated how the field of algebraic geometry had changed. It is still an important reference.

It seems to have been this work that set the seal of Zariski's discontent with the approach of the Italians to birational geometry. He addressed the question of rigour by recourse to commutative algebra. The Zariski topology, as it was later known, is adequate for ''biregular geometry'', where varieties are mapped by polynomial functions. That theory is too limited for algebraic surfaces, and even for curves with singular points. A rational map is to a regular map as a rational function is to a polynomial: it may be indeterminate at some points. In geometric terms, one has to work with functions defined on some open, dense set of a given variety. The description of the behaviour on the complement may require infinitely near points to be introduced to account for limiting behaviour ''along different directions''. This introduces a need, in the surface case, to use also valuation theory to describe the phenomena such as blowing up (balloon-style, rather than explosively).

Harvard University years

After spending a year 1946–1947 at the University of Illinois at Urbana–Champaign, Zariski became professor at Harvard University in 1947 where he remained until his retirement in 1969. In 1945, he fruitfully discussed foundational matters for algebraic geometry with André Weil. Weil's interest was in putting an abstract variety theory in place, to support the use of the Jacobian variety in his proof of the Riemann hypothesis for curves over finite fields, a direction rather oblique to Zariski's interests. The two sets of foundations weren't reconciled at that point.

At Harvard, Zariski's students included Shreeram Abhyankar, Heisuke Hironaka, David Mumford, Michael Artin and Steven Kleiman—thus spanning the main areas of advance in singularity theory, moduli theory and cohomology in the next generation. Zariski himself worked on equisingularity theory. Some of his major results, Zariski's main theorem and the Zariski theorem on holomorphic functions, were amongst the results generalized and included in the programme of Alexander Grothendieck that ultimately unified algebraic geometry.

Zariski proposed the first example of a Zariski surface in 1958.

Views

Zariski was a Jewish atheist.

Awards and recognition

Zariski was elected to the United States National Academy of Sciences in 1944, the American Academy of Arts and Sciences in 1948, and the American Philosophical Society in 1951. Zariski was awarded the Steele Prize in 1981, and in the same year the Wolf Prize in Mathematics with Lars Ahlfors. He wrote also ''Commutative Algebra'' in two volumes, with Pierre Samuel. His papers have been published by MIT Press, in four volumes. In 1997 a conference was held in his honor in Obergurgl, Austria.

Publications

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See also

* Zariski ring
*Zariski tangent space
* Zariski surface
*Zariski topology
* Zariski–Riemann surface
* Zariski space (disambiguation)
* Zariski's lemma
*Zariski's main theorem

Notes

References

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External links

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Biography
from United States Naval Academy.

{{DEFAULTSORT:Zariski, Oscar
1899 births
1986 deaths
People from Kobryn
People from Brookline, Massachusetts
Belarusian atheists
Belarusian Jews
Jewish American atheists
American people of Belarusian-Jewish descent
20th-century American mathematicians
American mathematicians
Institute for Advanced Study visiting scholars
Belarusian scientists
National Medal of Science laureates
Algebraic geometers
Johns Hopkins University faculty
Harvard University Department of Mathematics faculty
Wolf Prize in Mathematics laureates
Presidents of the American Mathematical Society
University of Illinois Urbana-Champaign faculty
Members of the United States National Academy of Sciences
20th-century Ukrainian mathematicians
Italian mathematicians
Emigrants from the Russian Empire to the United States
Members of the American Philosophical Society