Field Axioms – ground rules

http://mathworld.wolfram.com/FieldAxioms.html

http://www.math.purdue.edu/~rcp/FieldAxioms.pdf

Why is (-a) x (-b) = a x b?

http://mathforum.org/library/drmath/view/51925.html

Why can’t I divide by 0?

http://barnyard.syr.edu/divbyzero.pdf