Discover Questions

Who invented math? And how we know that he or she was right? Is the sky actually up? 4 Fe(s) + 3O2(g) ->2Fe2O3(g). 27.3 g of iron reacts with 79.9 g of Oxygen. How many grams of the excess reactant remain after the reaction? Why is coast elevation lower than inland elevation? Prove that for any finite dimensional vector space V with ordered basis \beta, \phi-(\beta) is an isomorphism.?