I am referring to the standard Russell set. However, the Russell set, according to page 432 of the aforementioned Barwise and Etchemendy (1999, 2000, 2002, 2003, 2007, 2008), is the set of all things that are not elements of themselves, not the set of all sets that are not elements of themselves. The set of all things that are not elements of themselves is a more natural and better set to be called the Russell set than the other set. It’s more comprehensive. I concede I did coin the term the absolute Russell set myself. But my term was readily derived from page 432 of Barwise and Etchemendy (1999, 2000, 2002, 2003, 2007, 2008), where they put the word absolute in parenthesis.
Barwise and Etchemendy (1999, 2000, 2002, 2003, 2007, 2008) do not seem to formally define the absolute Russell set; they only describe and discuss it.
This is where copyright law comes into play. I’m hesitant to copy a copyrighted formal definition or symbolic expression, especially when it may not be common knowledge. I actually, in my past post at viewtopic.php?p=2699066#p2699066, which I previously cited in this thread twice already, did not use the same letter to represent the absolute Russell set as Barwise and Etchemendy (1999, 2000, 2002, 2003, 2007, 2008) do. I was afraid it might be a copyright violation or plagiarism.
I disagree. It could be worse. It could get worse.
I wish to be enlightened and to advance.