- #1
Reshma
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I am trying to teach myself some complex analysis. I am using Complex Numbers by Churchill & Brown as my reference. I have reached the integration section and I am encountering certain difficulties.
For e.g. I have this problem:
[tex]\oint \frac{dz}{z^2 - z -2}, |z|\leq 3[/tex]
I can split up the integrand using partial fractions but I don't know how to interpret the boundary conditions that they have given.
Cauchy's integral formula gives:
[tex]\int_C
\frac{f(z)dz}{z - a} = 2\pi i f(a)[/tex]
Where f(z) is analytic and single valued within a closed curve 'C' and 'a' is any point interior to C.
Cauchy-Goursat theorem states:
[tex]\int_C f(z)dz = \int_a^b f[z(t)] z'(t) dt , a\leq t \leq b [/tex]
I don't know whether I should use the Cauchy-integral formula or the Cauchy-Goursat theorem.
Can someone help me out here?
For e.g. I have this problem:
[tex]\oint \frac{dz}{z^2 - z -2}, |z|\leq 3[/tex]
I can split up the integrand using partial fractions but I don't know how to interpret the boundary conditions that they have given.
Cauchy's integral formula gives:
[tex]\int_C
\frac{f(z)dz}{z - a} = 2\pi i f(a)[/tex]
Where f(z) is analytic and single valued within a closed curve 'C' and 'a' is any point interior to C.
Cauchy-Goursat theorem states:
[tex]\int_C f(z)dz = \int_a^b f[z(t)] z'(t) dt , a\leq t \leq b [/tex]
I don't know whether I should use the Cauchy-integral formula or the Cauchy-Goursat theorem.
Can someone help me out here?
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