http://1-formula.com/chemical-formulas/eulers-formula.html Euler's equation gives a powerful formula for quick calculation of the functional derivative and Euler formula is most striking and elegant relations in mathematics too. en-us Sat, 11 Oct 2008 21:32:30 GMT Fri, 19 Sep 2008 16:13:36 GMT www.1-formula.com www.1-formula.com http://1-formula.com/chemical-formulas/eulers-formula/euler-formula.html Euler's Formula for graphs, and then suggest why it is true for polyhedra. If you haven't met the idea of a graph before you might like to have a look here. Fri, 19 Sep 2008 16:13:36 GMT http://1-formula.com/chemical-formulas/eulers-formula/euler-formula.html