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本院數理組院士楊忠道教授生於1923年5月4日，不幸於9月14日因癌症
病逝於美國賓州，享壽82歲。
楊院士1946年浙江大學數學系畢業，1952年獲美國Tulane大學數學博士。
曾任中研院數學所助理員（19481949）、助理研究員（19491950），
後任職美國賓州大學助教授、副教授、教授至退休。1968年當選中研院
第七屆院士，並任數學所諮詢委員十多年（19922004），對本所所務
有諸多建言。
楊院士專精拓樸中具群作用的流形理論，尤其對Blaschke猜想作出重大貢獻，
解決此猜想的球狀情形。
A glance at the academic work of Professor ChungTao Yang
Professor ChungTao Yang published an impressive list of mathematical works
most of
which are in topology, more precisely, manifolds with group action. Among his
mathematical
works, the most influential is the one on the Blaschke conjecture—together with
others, he
solved affirmatively the sphere version of the conjecture. To our knowledge,
the following is
a summary of Professor Yang’s work, and we refer the interested readers to his
publication
for more details.
(I) In his early age, Professor Yang was interested in finite projective geometry,
and published
some impressive work, in particular that on finite geometry of spheres, projective
plane and
projective collineation.
(II) From 1950’s and on, Professor Yang, alone or together with Dean Montgomery
et al.,
published some influential work on transformation group, in particular that
on group action
on spheres. In that baby age of algebraic topology and differential topology,
these results are
groundbreaking and hence lay the foundation of the theory thereof.
(III) From 1980’s and on, Professor Yang applied the technique of transformation
group to
study the Blaschke conjecture and came up with his affirmative solution to the
conjecture in
the sphere case.
(IV) As wellknown in the mathematics community, Hilbert’s 23 problems in 1900
play a
leading role in the development of mathematics in the 20th century. As a leading
mathematician
in his field, Professor Yang was among very few distinguished mathematicians
chosen to
present the status of Hilbert’s problems in the Hilbert symposium organized
by the American
Mathematical Society in 1974.
Being both a productive researcher and an enthusiastic educator in mathematics,
Professor
ChungTao Yang came back to Taiwan from time to time to give lectures and to
advise us in
all aspects of mathematics. The Institute of Mathematics, Academia Sinica is
saddened to lose
such a good teacher.
