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Results tagged with short-exact-sequences
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user 322
For questions about short exact sequences in various contexts, including questions on short exact sequences of groups or modules.
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An "existence contra partition of unity" statement for integer matrices?
I believe that what you say is true. I'll sketch an argument.
Let f:Zn ---> Z2n be the map of free Z-modules given by the matrices B1, B2 put in column (i.e. the direct sum of the morphisms given by …
