# what is the cauchy-coursat theorem state specificly in word?

what is the cauchy-coursat theorem state specifically in word? Is it calculate the area or the legth,which area and what legth? please give a example! And what is deformation of contour?

-
You probably mean Cauchy-Goursat. Did you ask google? Clicking this link should give you quite a few hits. –  t.b. Jul 10 '11 at 20:12
Deformation of contour refers to homotopy. This whole machinery is dealt with nicely in John Conway's complex analysis book. –  ncmathsadist Jul 10 '11 at 20:27