Sign up ×
Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

I have seen two expressions of KdV Equation:

$$u_t-6uu_x+u_{xxx}=0$$ $$u_t+uu_x+u_{xxx}=0$$

Are they the same? How can I transform one from another?

share|cite|improve this question

1 Answer 1

up vote 3 down vote accepted

If $v = -6 u$, then $v_t + v v_x + v_{x x x} = -6 (u_t - 6 u u_x + u_{xxx})$.

share|cite|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.