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C9 question 1 typo?

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**Qiaochu Yang**:

In chapter 9 question 1

(Δ+ω2)u=0

instead of u, should it be v since v satisfies Helmholtz equation?

**Jingxuan Zhang**:

yes.

**Victor Ivrii**:

Exactly where?

**Qiaochu Yang**:

--- Quote from: Victor Ivrii on March 29, 2018, 10:10:29 AM ---Exactly where?

--- End quote ---

http://www.math.toronto.edu/courses/apm346h1/20181/PDE-textbook/Chapter9/S9.P.html problem 1

**Victor Ivrii**:

OK

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