--- a/src/HOL/Library/Library.thy Sun Feb 28 21:31:35 2021 +0100 +++ b/src/HOL/Library/Library.thy Sun Feb 28 20:13:07 2021 +0000 @@ -24,6 +24,7 @@ Diagonal_Subsequence Discrete Disjoint_Sets + Disjoint_FSets Dlist Dual_Ordered_Lattice Equipollence