Invariant factor: Difference between revisions

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clarify phrase (by replacing the horrendous Z^+_0 notation)
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==References==
* {{cite book | author=B. Hartley | authorlink=Brian Hartley | coauthorsauthor2=T.O. Hawkes | title=Rings, modules and linear algebra | publisher=Chapman and Hall | year=1970 | isbn=0-412-09810-5 }} Chap.8, p.128.
* Chapter III.7, p.153 of {{Lang Algebra|edition=3}}