i) What is important about concept of zero beyond its use as place holder?
ii) Find significance of using the particular symbol to represent the absence of quantity?
iii) What role zero plays as mathematical concept and how it fit within cultures as it was first understood?
iv) What challenges were faced by cultures which didn't have the zero in their number system and how were the challenges addressed?
v) What cultural influences come into play?
vi) Was new concept readily accepted and if not, what cultural influences have prevented acceptance?