fom
Posts:
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Registered:
12/4/12


Re: Using classes instead of sets
Posted:
Mar 28, 2013 8:45 PM


On 3/28/2013 3:54 PM, Ken Pledger wrote: > In article <19071bf469f84ce394cb109044e3f323@googlegroups.com>, > pepstein5@gmail.com wrote: > >> .... Classes are allowed to contain other classes after all.... > > > Are you confusing members with subclasses? In Paul Halmos's classic > "How to Write Mathematics", section 14, he suggests using "contain" for > members and "include" for subsets. That convention may not be not > widely used, but at least it draws attention to the possible ambiguity > of "contains". > > Ken Pledger. >
So when I quickly open my calculus book from so many years ago, ...
"is a subset of" is the same as "is contained in"
I have a feeling that the ambiguity of this particular colloquialism is here to stay.
That article is wonderful by the way. I suspect you already know that.

