Whitehead torsion
نویسندگان
چکیده
منابع مشابه
Alfred North Whitehead
Alfred North Whitehead (1861-1947) never wrote a comprehensive work in philosophy of education, but he occasionally delivered lectures concerned with educational policy. These incisive talks are collected in his book The Aims of Education and Other Essays. Whitehead and Dewey were contemporaries, and their ideas are in some notable respects similar. Like Dewey, Whitehead stresses the importance...
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A (right R-) module N is said to be a Whitehead test module for projectivity (shortly: a p-test module) provided for each module M , ExtR(M,N) = 0 implies M is projective. Dually, i-test modules are defined. For example, Z is a p-test abelian group iff each Whitehead group is free. Our first main result says that if R is a right hereditary non-right perfect ring, then the existence of p-test mo...
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ژورنال
عنوان ژورنال: Bulletin of the American Mathematical Society
سال: 1966
ISSN: 0002-9904
DOI: 10.1090/s0002-9904-1966-11484-2