I am seekinhg to understand example 4 on page 9 of Cohn's book "Introduction to Ring Theory"
The example needs a clear understanding of the nottion of a family which Cohn briefly introduces on page 3 where he defines the notion of a set and members of a set and then defines a family mentioning how families are indexed (see attachment showing Cohn page 3) .
I am struggling with this notion and would appreciate someone giving me an example which clearly shows the nature and role of the index.
Peter
The example needs a clear understanding of the nottion of a family which Cohn briefly introduces on page 3 where he defines the notion of a set and members of a set and then defines a family mentioning how families are indexed (see attachment showing Cohn page 3) .
I am struggling with this notion and would appreciate someone giving me an example which clearly shows the nature and role of the index.
Peter
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