Saharon Shelah (, born
July 3,
1945 in
Jerusalem) is an
Israeli mathematician. He is a professor of
mathematics at the
Hebrew University of Jerusalem and also at
Rutgers University in
New Jersey,
U.S.. Shelah's main interest lies in
mathematical logic, in particular in
model theory and
set theory.Shelah is one of the most prolific contemporary mathematicians. As of 2006, he had (together with over 200 coauthors) published nearly 900 mathematical papers. Among his most important results are:in
model theory, the introduction and development of his classification theory, which led him to a solution of
Morley's problemin
set theory, the invention of the notion of proper forcing, an important tool in iterated
forcing arguments
PCF theory, which shows that in spite of the undecidability of the most basic questions of cardinal arithmetic (such as the
continuum hypothesis), there are highly nontrivial
ZFC theorems about
cardinal exponentiation, after all.
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