Date: Mar 24, 2013 9:42 AM
Subject: Re: Matheology § 224
On 3/24/2013 3:50 AM, WM wrote:
> On 24 Mrz., 02:30, Virgil <vir...@ligriv.com> wrote:
>> Given: that deleting anyone set from a union of sets does not decrease
>> the union the set of remaining sets,
>> THEN: Decreasing that union will require, if possible at all, deleting
>> more than one member set, but deleting more than one member set still
>> may not alsays decrease the union.
>> Example: 100 different subsets each of 99 elements out of their union of
>> 100 elements. Then the union of the set of any two or more of them
>> equals the union of the set of all 100 of them.
> Enumerate the sets. Then there will be a first set that, when
> subtracted from the union, will change the union of the remaining
He is talking about the kind of "set" that every
student in mathematics (except, perhaps, yours)
He is not talking about the theory of
"monotonic-inclusive crayon marks".
union of 10 sets:
Pick a set from the 10 given
sets that, when removed, changes
Examples involving crayon marks
shall be left to others.