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### Messages - Zhekai Pang

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##### Chapter 1 / Re: Past quiz 1
« on: September 20, 2020, 12:09:42 PM »
I disagree. By definition of norm, it is nonnegative. Thus, in order for Re$(z) = |\cdot|$, it has to be nonnegative. You cannot make the first equivalence. For example, $|z| = -3$ is an empty set, although $x^2+y^2=9$ is a circle.

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##### Chapter 1 / Past quiz 1
« on: September 19, 2020, 11:17:42 PM »
http://forum.math.toronto.edu/index.php?topic=1278.0

Why is it a whole line? I also think Re$(z) \geq 0$ is required because the original equation is Re$(z) = | \cdot|$.

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##### Chapter 1 / More on inversion
« on: September 15, 2020, 07:47:28 PM »
In addition to the last slide of today's lecture.

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