You can find an overview of methods for non-integer tetration at
this wikipedia page (quick shot with some direct formulas but no embedding information)
and in
this overview paper (unfinished work in progress, last updated 28th June 2010)
this wikipedia page (quick shot with some direct formulas but no embedding information)
and in
this overview paper (unfinished work in progress, last updated 28th June 2010)
