Identification of the F-different with the different
Let be an -finite normal local ring of characteristic , let , and let be an effective -divisor on , where is a normal prime divisor with defining ideal and is not contained in . Let be the effective -divisor on induced by the restriction of the Frobenius map associated to . The different of on is the divisor defined by adjunction. The F-different identification. The divisors coincide:
This identifies the divisor obtained from Frobenius restriction with the classical different, linking -singularity methods with adjunction. The source gives no resolution status for this claim.
References
Primary source
Osamu Fujino, Karl Schwede and Shunsuke Takagi, “Supplements to non-lc ideal sheaves”, arXiv:1004.5170 (2011).
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