Note on Euler formulahttp://www.avidsynergy.com/pdf/Euler_formula.pdf
Cauchy's Theorem and Theorem of Residueshttp://www.avidsynergy.com/pdf/CauchyTheoremAndResiduesTheorem.pdf
Note on Cauchy-Riemann conditionshttp://www.avidsynergy.com/pdf/Cauchy_Riemann_conditions.pdf