Why is the characteristic of(adsbygoogle = window.adsbygoogle || []).push({});

(d/dx) + (d/dt) = 0 where d is small delta

c = x - t and not c = x + t

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# 2nd order PDE characteristics

**Physics Forums | Science Articles, Homework Help, Discussion**