In <SvmdnSXO9rHv-YLMnZ2dnUVZ_oydnZ2d@giganews.com>, on 02/16/2013 at 04:50 AM, fom <fomJUNK@nyms.net> said:
>No problem here. No difference set contains the letter with >which it is associated.
What is a difference set and how is it relevant to 'it is intuitively reasonable to think of a letter as "a collection of letters"'. What are the letters that are elements of the letter L. If your answer is L, then you have problems with regularity.
>If one looks at the statement of regularity closely, the class of >sets that do not contain the empty set all act to separate at least >one set-as-object from that same set in the sense of >set-as-collection.
Theories such as ZFC don't have such a distinction.
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