10 [ { "natural numbers with infinity" * } {
11 [ "ynat ( ∞ )" "ynat_pred ( ⫰? )" "ynat_succ ( ⫯? )" "ynat_le ( ?≤? )" "ynat_lt ( ?<? )" "ynat_minus ( ? - ? )" "ynat_plus ( ? + ? )" "ynat_max" "ynat_min" * ]
15 [ { "extensions to the library" * } {
16 [ "arith.ma ( ?^? )" * ]
20 [ { "generated logical decomposables" * } {
21 [ "xoa ( ∃∃ ) ( ∨∨ ) ( ∧∧ )" "xoa_props ( ⊥ ) ( ⊤ )" * ]