Schröer's klt type and strong F-regularity conjecture

Let R=(C[X1,,Xn]/(f1,,fr))(X1,,Xn)R=\left(\mathbb{C}[X_1, \dots, X_n]/(f_1, \dots, f_r)\right)_{(X_1, \dots, X_n)}, where each fiZ[X1,,Xn]f_i\in\mathbb{Z}[X_1,\dots,X_n], and let RmodpR\bmod p denote its reduction modulo the prime pp. Schröer's conjecture. SpecR\operatorname{Spec} R is of klt type if and only if RmodpR\bmod p is strongly FF-regular for all but finitely many pp. The only-if direction is known, and the if direction is known when RR is Q\mathbb{Q}-Gorenstein or its anti-canonical ring is Noetherian; the general case remains open even in dimension three.

Sources & referencesView supporting material

Primary source

Shunsuke Takagi and Tatsuki Yamaguchi, “On the uniform positivity of F-signature under reduction modulo p”, arXiv:2507.16566 (2026).

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