A THEORY OF RELATIVE EXTENSIONS FOR SUBALGEBRAS AND SUBMODULES

Original Articles

A THEORY OF RELATIVE EXTENSIONS FOR SUBALGEBRAS AND SUBMODULES

Published in: Quaestiones Mathematicae
Volume 9 , issue 1-4 , 1986 , pages: 471–493
DOI: 10.1080/16073606.1986.9632128
Author(s): Klaus , Werner Wiegmann , Federal Republic of Germany
Keywords: 13D03 , 13B02 , 18G15 , 18C99
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Abstract

We consider two pairs (A,B) and (G,F) where A ⊂ B is a subalgebra over a commutative ring K with unit, F is a B-module and G ⊂ F is a sub-A-module. A relative extension of (A,B) by (G,F) is a commutative diagram
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