Exact formulas are derived for the δ-invariant of (P2, λC_d) for all plane curves C_d of degree d ≤ 4, classified by singularity type.
Cheltsov, On singular cubic surfaces , Asian Journal of Mathematics 13 (2009), 191-214
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$\delta$-invariants of log Fano planes
Exact formulas are derived for the δ-invariant of (P2, λC_d) for all plane curves C_d of degree d ≤ 4, classified by singularity type.