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We consider the fifth order KdV type equations and prove the unconditionalwell-posedness in $H^s(\mathbb{T})$ for $s \ge 1$. It is optimal in the sensethat the nonlinear terms can not be defined in the space-time distributionframework for $s<1$. The main idea is to employ the normal form reduction and akinds of cancellation properties to deal with the derivative losses.

Cancellation properties and unconditional well-posedness for the fifth order KdV type equations with periodic boundary condition