(October 4, 2014 at 11:05 am)Deidre32 Wrote: I see, thanks Chas. why use it (zero) at all when dividing then?
1/x tends to infinity as x tends to zero. Strictly seeking, mathematically, one cannot divide by zero, but there are many quantities in physics where this can occur, for instance QFT is plagued with these infinities. There are several techniques to deal with such instances.