1 vote

Prove this is an exact sequence

If one of $a,b$ is 0, then the proof is easy. So assume $a,b\not=0$. The last map in the sequence should be $$f: ao + bo \longrightarrow o/(ao:bo)$$ $$ as + br \mapsto r$$ To see $f$ is well-defined, ...
  • 310

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