#### Yumeng Wang

• APM346
• Full Member
• Posts: 20
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« on: October 03, 2015, 01:05:49 PM »
After I read section 2.6 of online textbook, I find out there are two places need professor to clarify.
1. After equation (7), you have written
"Therefore, Ï•(x+ct) and Ïˆ(xâˆ’ct) are defined respectively as x+ct>0 (which is automatic as x>0,t>0) and xâˆ’ct<0 (which is fulfilled only as   x>ct)."  -- Indeed (PS. Don't use red--I use it)
Should the equation with read color be xâˆ’ct>0?
2. Picture "Fig-2.6.2" cannot be displayed. After I checked code of the website, it displayed 404 ERROR (page not found).
Without this picture, I cannot quite understand context in " 1D Wave equation on the finite interval ".

Was wrong address for an image. Fixed