### Author Topic: Clarification about Textbook Section 2.1.2  (Read 1085 times)

#### Emily Deibert ##### Clarification about Textbook Section 2.1.2
« on: September 23, 2015, 11:38:10 PM »
Hi Professor,

In section 2.1.2 of the online textbook ("Constant Coefficients") you have written in the example:

"Consider initial value condition u|t = 0 = f(x). It allows us define Ï•: Ï•(x) = f(x)"

I'm wondering: do you mean that f(x) = 0? Or should the statement read:

Consider initial value condition u|t=0 = f(x)

implying that f(x) is the value of u where t = 0?

Thank you for the help!

#### Emily Deibert ##### Re: Clarification about Textbook Section 2.1.2
« Reply #1 on: September 23, 2015, 11:56:33 PM »
To reply to my own question, after reading further in the online textbook it seems clear that the condition was that u(x,0) = f(x), not that f(x) = 0.

#### Victor Ivrii ##### Re: Clarification about Textbook Section 2.1.2
« Reply #2 on: September 24, 2015, 02:11:09 AM »
So it turned out to be a misprint which should be reported here. Fixed and following misprint fixed (Definition 1). Thanks!