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In 1993, P. Rosenau and J. M. Hyman introduced and studiedKorteweg-de-Vries-like equations with nonlinear dispersion admitting compactonsolutions, $u_t+D_x^3(u^n)+D_x(u^m)=0$, $m,n>1$, which are known as the$K(m,n)$ equations. In the present paper we consider a slightly generalizedversion of the $K(m,n)$ equations for $m=n$, namely,$u_t=aD_x^3(u^m)+bD_x(u^m)$, where $m,a,b$ are arbitrary real numbers. Wedescribe all generalized symmetries and conservation laws thereof for $m\neq-2,-1/2,0,1$; for these four exceptional values of $m$ the equation in questionis either completely integrable ($m=-2,-1/2$) or linear ($m=1$) or trivial($m=0$). It turns out that for $m\neq -2,-1/2,0,1$ there are only threesymmetries corresponding to $x$- and $t$-translations and scaling of $t$ and$u$, and four nontrivial conservation laws, one of which expresses theconservation of energy, and the other three are associated with the Casimirfunctionals of the Hamiltonian operator $\mathfrak{D}=aD_x^3+bD_x$ admitted byour equation. Our result, \textit{inter alia}, provides a rigorous proof of thefact that the K(2,2) equation has just four conservation laws found by P.Rosenau and J. M. Hyman.

A complete list of conservation laws for non-integrable compacton equations of $K(m,m)$ type