By definition, a number that's infinitesimal is close to, but greater than, this
The real numbers 
R is an example of a field, a space where you can add, subtract, .... You say that 
infinitesimals must be greater than zero but then go on to state... [DOC] [TLE] Infinitesimal - Wikipedia [PAR] In mathematics, infinitesimals are things so small that there is no way to measure 
them.