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We prove the normality of minimal log canonical centers on threefold pairswhich residue fields are perfect of residue characteristics $p\neq 2,3 $ and$5$. We also show that the union of all log canonical centers on threefoldpairs with standard coefficients are seminormal provided that the residuecharacteristic is large enough. We provide an example of a non-seminormal logcanonical center on a threefold in characteristic $3$, and give sufficientconditions to construct similar examples.

Normality of minimal log canonical centers of threefolds in mixed and positive characteristic