- #1
Bashyboy
- 1,421
- 5
Homework Statement
##z(t) = t + it^2## and ##f(z) = z^2 = (x^2 - y^2) + 2iyx##
Homework Equations
The Attempt at a Solution
Because ##f(z)## is analytic everywhere in the plane, the integral of ##f(z)## between the points ##z(1) = (1,1)## and ##z(3) = (3,9)## is independent of the contour (the path taken). So, I can choose a simpler contour which passes through these two points, such as a line.
Using the two points to find the slope, and parameterizing it, we get the straight-line contour
##z_1(\tau) = \tau + i(4 \tau + 3)##.
Here is where I am having difficulty. How exactly do I find the interval between the two points? This is how I did it, but am I unsure if it is correct:
##z(\tau) = (1,1) \implies##
##(\tau, 4 \tau + 3) = (1,1)##
which gives us the two equations
##\tau = 1## and ##4 \tau + 3 = 1##.
However, I get a different ##\tau## value from each equation. What can account for this?