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If-0-M-f-M-g-M-0-is-a-short-exact-sequence-and-M-M-are-two-finitely-generated-R-modules-then-prove-M-is-finitely-generated-Hint-f-g-are-two-R-ho




Question Number 190784 by mnjuly1970 last updated on 11/Apr/23
    If , 0 ⇢ M′ ⇢^f M⇢^g M′′⇢0 is      a short exact sequence  and  M′ , M′′ are     two  finitely generated  R −modules     then  prove   M  is  finitely generated.      Hint:  f  ,  g   are  two   R − homomorphism.
$$ \\ $$$$\:\:\mathrm{If}\:,\:\mathrm{0}\:\dashrightarrow\:\mathrm{M}'\:\overset{{f}} {\dashrightarrow}\mathrm{M}\overset{{g}} {\dashrightarrow}\mathrm{M}''\dashrightarrow\mathrm{0}\:\mathrm{is} \\ $$$$\:\:\:\:\mathrm{a}\:\mathrm{short}\:\mathrm{exact}\:\mathrm{sequence}\:\:\mathrm{and}\:\:\mathrm{M}'\:,\:\mathrm{M}''\:\mathrm{are} \\ $$$$\:\:\:\mathrm{two}\:\:\mathrm{finitely}\:\mathrm{generated}\:\:\mathrm{R}\:−\mathrm{modules} \\ $$$$\:\:\:\mathrm{then}\:\:\mathrm{prove}\:\:\:\mathrm{M}\:\:\mathrm{is}\:\:\mathrm{finitely}\:\mathrm{generated}.\: \\ $$$$\:\:\:\mathrm{Hint}:\:\:{f}\:\:,\:\:{g}\:\:\:{are}\:\:{two}\:\:\:{R}\:−\:{homomorphism}. \\ $$

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