show/hide this revision's text 2 Fixexd links (hopefully!)
show/hide this revision's text 1

Try this: www.dpmms.cam.ac.uk/~cb496/nsag1.pdf and also this http://wwwmath.uni-muenster.de/u/serpe/documents/ultramath2008serpe-nonstandard-handout.pdf, logicandanalysis.org/index.php/jla/article/view/77/29

and references therein. Sorry I don't know how to make a link.