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I've started reading

*The Road To Reality*, by R. Penrose, and I've made my way through the first six chapters. Now the author talks about contour integration, and I'm really confused with his explanation.

He says a few things about homologous and homotopic deformations, and then, he talks about the contour integral of [tex]\frac{1}{z}[/tex], and finally Cauchy formula.

Do you know anywhere I could possibly find more (comprehensible) information on those topics?

Thank you very much.