The strong persistence property and symbolic strong persistence property

summary:Let $I$ be an ideal in a commutative Noetherian ring $R$. Then the ideal $I$ has the strong persistence property if and only if $(I^{k+1}\colon _R I)=I^k$ for all $k$, and $I$ has the symbolic strong persistence property if and only if $(I^{(k+1)}\colon _R I^{(1)})=I^{(k)}$ for all $k$, where $I^{(k)}$ denotes the $k$th symbolic power of $I$. We study the strong persistence property for some classes of monomial ideals. In particular, we present a family of primary monomial ideals failing the strong persistence property. Finally, we show that every square-free monomial ideal has the symbolic strong persistence property