确界原理 supremum and infimum principle 戴德金定理 Dedekind theorem

确界原理  supremum and infimum principle  戴德金定理  Dedekind theorem  

 

http://www.math.ubc.ca/~cass/courses/m446-05b/dedekind-book.pdf#page=15

continulity and irrational numbers
the nature and meaning of numbers