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Theorem rankxplim3 8919
Description: The rank of a Cartesian product is a limit ordinal iff its union is. (Contributed by NM, 19-Sep-2006.)
Hypotheses
Ref Expression
rankxplim.1 𝐴 ∈ V
rankxplim.2 𝐵 ∈ V
Assertion
Ref Expression
rankxplim3 (Lim (rank‘(𝐴 × 𝐵)) ↔ Lim (rank‘(𝐴 × 𝐵)))

Proof of Theorem rankxplim3
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 limuni2 5947 . 2 (Lim (rank‘(𝐴 × 𝐵)) → Lim (rank‘(𝐴 × 𝐵)))
2 0ellim 5948 . . . 4 (Lim (rank‘(𝐴 × 𝐵)) → ∅ ∈ (rank‘(𝐴 × 𝐵)))
3 n0i 4063 . . . 4 (∅ ∈ (rank‘(𝐴 × 𝐵)) → ¬ (rank‘(𝐴 × 𝐵)) = ∅)
4 unieq 4596 . . . . . 6 ((rank‘(𝐴 × 𝐵)) = ∅ → (rank‘(𝐴 × 𝐵)) = ∅)
5 uni0 4617 . . . . . 6 ∅ = ∅
64, 5syl6eq 2810 . . . . 5 ((rank‘(𝐴 × 𝐵)) = ∅ → (rank‘(𝐴 × 𝐵)) = ∅)
76con3i 150 . . . 4 (rank‘(𝐴 × 𝐵)) = ∅ → ¬ (rank‘(𝐴 × 𝐵)) = ∅)
82, 3, 73syl 18 . . 3 (Lim (rank‘(𝐴 × 𝐵)) → ¬ (rank‘(𝐴 × 𝐵)) = ∅)
9 rankon 8833 . . . . . . . . . 10 (rank‘(𝐴𝐵)) ∈ On
109onsuci 7204 . . . . . . . . 9 suc (rank‘(𝐴𝐵)) ∈ On
1110onsuci 7204 . . . . . . . 8 suc suc (rank‘(𝐴𝐵)) ∈ On
1211elexi 3353 . . . . . . 7 suc suc (rank‘(𝐴𝐵)) ∈ V
1312sucid 5965 . . . . . 6 suc suc (rank‘(𝐴𝐵)) ∈ suc suc suc (rank‘(𝐴𝐵))
1411onsuci 7204 . . . . . . . 8 suc suc suc (rank‘(𝐴𝐵)) ∈ On
15 ontri1 5918 . . . . . . . 8 ((suc suc suc (rank‘(𝐴𝐵)) ∈ On ∧ suc suc (rank‘(𝐴𝐵)) ∈ On) → (suc suc suc (rank‘(𝐴𝐵)) ⊆ suc suc (rank‘(𝐴𝐵)) ↔ ¬ suc suc (rank‘(𝐴𝐵)) ∈ suc suc suc (rank‘(𝐴𝐵))))
1614, 11, 15mp2an 710 . . . . . . 7 (suc suc suc (rank‘(𝐴𝐵)) ⊆ suc suc (rank‘(𝐴𝐵)) ↔ ¬ suc suc (rank‘(𝐴𝐵)) ∈ suc suc suc (rank‘(𝐴𝐵)))
1716con2bii 346 . . . . . 6 (suc suc (rank‘(𝐴𝐵)) ∈ suc suc suc (rank‘(𝐴𝐵)) ↔ ¬ suc suc suc (rank‘(𝐴𝐵)) ⊆ suc suc (rank‘(𝐴𝐵)))
1813, 17mpbi 220 . . . . 5 ¬ suc suc suc (rank‘(𝐴𝐵)) ⊆ suc suc (rank‘(𝐴𝐵))
19 rankxplim.1 . . . . . . 7 𝐴 ∈ V
20 rankxplim.2 . . . . . . 7 𝐵 ∈ V
2119, 20rankxpu 8914 . . . . . 6 (rank‘(𝐴 × 𝐵)) ⊆ suc suc (rank‘(𝐴𝐵))
22 sstr 3752 . . . . . 6 ((suc suc suc (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵)) ∧ (rank‘(𝐴 × 𝐵)) ⊆ suc suc (rank‘(𝐴𝐵))) → suc suc suc (rank‘(𝐴𝐵)) ⊆ suc suc (rank‘(𝐴𝐵)))
2321, 22mpan2 709 . . . . 5 (suc suc suc (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵)) → suc suc suc (rank‘(𝐴𝐵)) ⊆ suc suc (rank‘(𝐴𝐵)))
2418, 23mto 188 . . . 4 ¬ suc suc suc (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵))
25 reeanv 3245 . . . . 5 (∃𝑥 ∈ On ∃𝑦 ∈ On ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦) ↔ (∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∧ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦))
26 simprl 811 . . . . . . . . . . . . 13 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → (rank‘(𝐴𝐵)) = suc 𝑥)
27 simpr 479 . . . . . . . . . . . . . . . . . 18 ((Lim (rank‘(𝐴 × 𝐵)) ∧ (rank‘(𝐴𝐵)) = suc 𝑥) → (rank‘(𝐴𝐵)) = suc 𝑥)
28 rankuni 8901 . . . . . . . . . . . . . . . . . . . . . 22 (rank‘ (𝐴 × 𝐵)) = (rank‘ (𝐴 × 𝐵))
29 rankuni 8901 . . . . . . . . . . . . . . . . . . . . . . 23 (rank‘ (𝐴 × 𝐵)) = (rank‘(𝐴 × 𝐵))
3029unieqi 4597 . . . . . . . . . . . . . . . . . . . . . 22 (rank‘ (𝐴 × 𝐵)) = (rank‘(𝐴 × 𝐵))
3128, 30eqtri 2782 . . . . . . . . . . . . . . . . . . . . 21 (rank‘ (𝐴 × 𝐵)) = (rank‘(𝐴 × 𝐵))
32 df-ne 2933 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝐴 × 𝐵) ≠ ∅ ↔ ¬ (𝐴 × 𝐵) = ∅)
3319, 20xpex 7128 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝐴 × 𝐵) ∈ V
3433rankeq0 8899 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝐴 × 𝐵) = ∅ ↔ (rank‘(𝐴 × 𝐵)) = ∅)
3534notbii 309 . . . . . . . . . . . . . . . . . . . . . . . . 25 (¬ (𝐴 × 𝐵) = ∅ ↔ ¬ (rank‘(𝐴 × 𝐵)) = ∅)
3632, 35bitr2i 265 . . . . . . . . . . . . . . . . . . . . . . . 24 (¬ (rank‘(𝐴 × 𝐵)) = ∅ ↔ (𝐴 × 𝐵) ≠ ∅)
378, 36sylib 208 . . . . . . . . . . . . . . . . . . . . . . 23 (Lim (rank‘(𝐴 × 𝐵)) → (𝐴 × 𝐵) ≠ ∅)
38 unixp 5829 . . . . . . . . . . . . . . . . . . . . . . 23 ((𝐴 × 𝐵) ≠ ∅ → (𝐴 × 𝐵) = (𝐴𝐵))
3937, 38syl 17 . . . . . . . . . . . . . . . . . . . . . 22 (Lim (rank‘(𝐴 × 𝐵)) → (𝐴 × 𝐵) = (𝐴𝐵))
4039fveq2d 6357 . . . . . . . . . . . . . . . . . . . . 21 (Lim (rank‘(𝐴 × 𝐵)) → (rank‘ (𝐴 × 𝐵)) = (rank‘(𝐴𝐵)))
4131, 40syl5reqr 2809 . . . . . . . . . . . . . . . . . . . 20 (Lim (rank‘(𝐴 × 𝐵)) → (rank‘(𝐴𝐵)) = (rank‘(𝐴 × 𝐵)))
42 eqimss 3798 . . . . . . . . . . . . . . . . . . . 20 ((rank‘(𝐴𝐵)) = (rank‘(𝐴 × 𝐵)) → (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵)))
4341, 42syl 17 . . . . . . . . . . . . . . . . . . 19 (Lim (rank‘(𝐴 × 𝐵)) → (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵)))
4443adantr 472 . . . . . . . . . . . . . . . . . 18 ((Lim (rank‘(𝐴 × 𝐵)) ∧ (rank‘(𝐴𝐵)) = suc 𝑥) → (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵)))
4527, 44eqsstr3d 3781 . . . . . . . . . . . . . . . . 17 ((Lim (rank‘(𝐴 × 𝐵)) ∧ (rank‘(𝐴𝐵)) = suc 𝑥) → suc 𝑥 (rank‘(𝐴 × 𝐵)))
4645adantrr 755 . . . . . . . . . . . . . . . 16 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → suc 𝑥 (rank‘(𝐴 × 𝐵)))
47 limuni 5946 . . . . . . . . . . . . . . . . 17 (Lim (rank‘(𝐴 × 𝐵)) → (rank‘(𝐴 × 𝐵)) = (rank‘(𝐴 × 𝐵)))
4847adantr 472 . . . . . . . . . . . . . . . 16 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → (rank‘(𝐴 × 𝐵)) = (rank‘(𝐴 × 𝐵)))
4946, 48sseqtr4d 3783 . . . . . . . . . . . . . . 15 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → suc 𝑥 (rank‘(𝐴 × 𝐵)))
50 vex 3343 . . . . . . . . . . . . . . . 16 𝑥 ∈ V
51 rankon 8833 . . . . . . . . . . . . . . . . . 18 (rank‘(𝐴 × 𝐵)) ∈ On
5251onordi 5993 . . . . . . . . . . . . . . . . 17 Ord (rank‘(𝐴 × 𝐵))
53 orduni 7160 . . . . . . . . . . . . . . . . 17 (Ord (rank‘(𝐴 × 𝐵)) → Ord (rank‘(𝐴 × 𝐵)))
5452, 53ax-mp 5 . . . . . . . . . . . . . . . 16 Ord (rank‘(𝐴 × 𝐵))
55 ordelsuc 7186 . . . . . . . . . . . . . . . 16 ((𝑥 ∈ V ∧ Ord (rank‘(𝐴 × 𝐵))) → (𝑥 (rank‘(𝐴 × 𝐵)) ↔ suc 𝑥 (rank‘(𝐴 × 𝐵))))
5650, 54, 55mp2an 710 . . . . . . . . . . . . . . 15 (𝑥 (rank‘(𝐴 × 𝐵)) ↔ suc 𝑥 (rank‘(𝐴 × 𝐵)))
5749, 56sylibr 224 . . . . . . . . . . . . . 14 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → 𝑥 (rank‘(𝐴 × 𝐵)))
58 limsuc 7215 . . . . . . . . . . . . . . 15 (Lim (rank‘(𝐴 × 𝐵)) → (𝑥 (rank‘(𝐴 × 𝐵)) ↔ suc 𝑥 (rank‘(𝐴 × 𝐵))))
5958adantr 472 . . . . . . . . . . . . . 14 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → (𝑥 (rank‘(𝐴 × 𝐵)) ↔ suc 𝑥 (rank‘(𝐴 × 𝐵))))
6057, 59mpbid 222 . . . . . . . . . . . . 13 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → suc 𝑥 (rank‘(𝐴 × 𝐵)))
6126, 60eqeltrd 2839 . . . . . . . . . . . 12 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → (rank‘(𝐴𝐵)) ∈ (rank‘(𝐴 × 𝐵)))
62 limsuc 7215 . . . . . . . . . . . . 13 (Lim (rank‘(𝐴 × 𝐵)) → ((rank‘(𝐴𝐵)) ∈ (rank‘(𝐴 × 𝐵)) ↔ suc (rank‘(𝐴𝐵)) ∈ (rank‘(𝐴 × 𝐵))))
6362adantr 472 . . . . . . . . . . . 12 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → ((rank‘(𝐴𝐵)) ∈ (rank‘(𝐴 × 𝐵)) ↔ suc (rank‘(𝐴𝐵)) ∈ (rank‘(𝐴 × 𝐵))))
6461, 63mpbid 222 . . . . . . . . . . 11 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → suc (rank‘(𝐴𝐵)) ∈ (rank‘(𝐴 × 𝐵)))
65 ordsucelsuc 7188 . . . . . . . . . . . 12 (Ord (rank‘(𝐴 × 𝐵)) → (suc (rank‘(𝐴𝐵)) ∈ (rank‘(𝐴 × 𝐵)) ↔ suc suc (rank‘(𝐴𝐵)) ∈ suc (rank‘(𝐴 × 𝐵))))
6654, 65ax-mp 5 . . . . . . . . . . 11 (suc (rank‘(𝐴𝐵)) ∈ (rank‘(𝐴 × 𝐵)) ↔ suc suc (rank‘(𝐴𝐵)) ∈ suc (rank‘(𝐴 × 𝐵)))
6764, 66sylib 208 . . . . . . . . . 10 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → suc suc (rank‘(𝐴𝐵)) ∈ suc (rank‘(𝐴 × 𝐵)))
68 onsucuni2 7200 . . . . . . . . . . . 12 (((rank‘(𝐴 × 𝐵)) ∈ On ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦) → suc (rank‘(𝐴 × 𝐵)) = (rank‘(𝐴 × 𝐵)))
6951, 68mpan 708 . . . . . . . . . . 11 ((rank‘(𝐴 × 𝐵)) = suc 𝑦 → suc (rank‘(𝐴 × 𝐵)) = (rank‘(𝐴 × 𝐵)))
7069ad2antll 767 . . . . . . . . . 10 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → suc (rank‘(𝐴 × 𝐵)) = (rank‘(𝐴 × 𝐵)))
7167, 70eleqtrd 2841 . . . . . . . . 9 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → suc suc (rank‘(𝐴𝐵)) ∈ (rank‘(𝐴 × 𝐵)))
7211, 51onsucssi 7207 . . . . . . . . 9 (suc suc (rank‘(𝐴𝐵)) ∈ (rank‘(𝐴 × 𝐵)) ↔ suc suc suc (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵)))
7371, 72sylib 208 . . . . . . . 8 ((Lim (rank‘(𝐴 × 𝐵)) ∧ ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → suc suc suc (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵)))
7473ex 449 . . . . . . 7 (Lim (rank‘(𝐴 × 𝐵)) → (((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦) → suc suc suc (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵))))
7574a1d 25 . . . . . 6 (Lim (rank‘(𝐴 × 𝐵)) → ((𝑥 ∈ On ∧ 𝑦 ∈ On) → (((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦) → suc suc suc (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵)))))
7675rexlimdvv 3175 . . . . 5 (Lim (rank‘(𝐴 × 𝐵)) → (∃𝑥 ∈ On ∃𝑦 ∈ On ((rank‘(𝐴𝐵)) = suc 𝑥 ∧ (rank‘(𝐴 × 𝐵)) = suc 𝑦) → suc suc suc (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵))))
7725, 76syl5bir 233 . . . 4 (Lim (rank‘(𝐴 × 𝐵)) → ((∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∧ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦) → suc suc suc (rank‘(𝐴𝐵)) ⊆ (rank‘(𝐴 × 𝐵))))
7824, 77mtoi 190 . . 3 (Lim (rank‘(𝐴 × 𝐵)) → ¬ (∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∧ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦))
79 ianor 510 . . . . . 6 (¬ (∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∧ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦) ↔ (¬ ∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∨ ¬ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦))
80 un00 4154 . . . . . . . . . . . . . 14 ((𝐴 = ∅ ∧ 𝐵 = ∅) ↔ (𝐴𝐵) = ∅)
81 olc 398 . . . . . . . . . . . . . . 15 (𝐵 = ∅ → (𝐴 = ∅ ∨ 𝐵 = ∅))
8281adantl 473 . . . . . . . . . . . . . 14 ((𝐴 = ∅ ∧ 𝐵 = ∅) → (𝐴 = ∅ ∨ 𝐵 = ∅))
8380, 82sylbir 225 . . . . . . . . . . . . 13 ((𝐴𝐵) = ∅ → (𝐴 = ∅ ∨ 𝐵 = ∅))
84 xpeq0 5712 . . . . . . . . . . . . 13 ((𝐴 × 𝐵) = ∅ ↔ (𝐴 = ∅ ∨ 𝐵 = ∅))
8583, 84sylibr 224 . . . . . . . . . . . 12 ((𝐴𝐵) = ∅ → (𝐴 × 𝐵) = ∅)
8685con3i 150 . . . . . . . . . . 11 (¬ (𝐴 × 𝐵) = ∅ → ¬ (𝐴𝐵) = ∅)
8735, 86sylbir 225 . . . . . . . . . 10 (¬ (rank‘(𝐴 × 𝐵)) = ∅ → ¬ (𝐴𝐵) = ∅)
8819, 20unex 7122 . . . . . . . . . . . 12 (𝐴𝐵) ∈ V
8988rankeq0 8899 . . . . . . . . . . 11 ((𝐴𝐵) = ∅ ↔ (rank‘(𝐴𝐵)) = ∅)
9089notbii 309 . . . . . . . . . 10 (¬ (𝐴𝐵) = ∅ ↔ ¬ (rank‘(𝐴𝐵)) = ∅)
9187, 90sylib 208 . . . . . . . . 9 (¬ (rank‘(𝐴 × 𝐵)) = ∅ → ¬ (rank‘(𝐴𝐵)) = ∅)
929onordi 5993 . . . . . . . . . . 11 Ord (rank‘(𝐴𝐵))
93 ordzsl 7211 . . . . . . . . . . 11 (Ord (rank‘(𝐴𝐵)) ↔ ((rank‘(𝐴𝐵)) = ∅ ∨ ∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∨ Lim (rank‘(𝐴𝐵))))
9492, 93mpbi 220 . . . . . . . . . 10 ((rank‘(𝐴𝐵)) = ∅ ∨ ∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∨ Lim (rank‘(𝐴𝐵)))
95943ori 1536 . . . . . . . . 9 ((¬ (rank‘(𝐴𝐵)) = ∅ ∧ ¬ ∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥) → Lim (rank‘(𝐴𝐵)))
9691, 95sylan 489 . . . . . . . 8 ((¬ (rank‘(𝐴 × 𝐵)) = ∅ ∧ ¬ ∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥) → Lim (rank‘(𝐴𝐵)))
9796ex 449 . . . . . . 7 (¬ (rank‘(𝐴 × 𝐵)) = ∅ → (¬ ∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 → Lim (rank‘(𝐴𝐵))))
98 ordzsl 7211 . . . . . . . . . 10 (Ord (rank‘(𝐴 × 𝐵)) ↔ ((rank‘(𝐴 × 𝐵)) = ∅ ∨ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦 ∨ Lim (rank‘(𝐴 × 𝐵))))
9952, 98mpbi 220 . . . . . . . . 9 ((rank‘(𝐴 × 𝐵)) = ∅ ∨ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦 ∨ Lim (rank‘(𝐴 × 𝐵)))
100993ori 1536 . . . . . . . 8 ((¬ (rank‘(𝐴 × 𝐵)) = ∅ ∧ ¬ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦) → Lim (rank‘(𝐴 × 𝐵)))
101100ex 449 . . . . . . 7 (¬ (rank‘(𝐴 × 𝐵)) = ∅ → (¬ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦 → Lim (rank‘(𝐴 × 𝐵))))
10297, 101orim12d 919 . . . . . 6 (¬ (rank‘(𝐴 × 𝐵)) = ∅ → ((¬ ∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∨ ¬ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦) → (Lim (rank‘(𝐴𝐵)) ∨ Lim (rank‘(𝐴 × 𝐵)))))
10379, 102syl5bi 232 . . . . 5 (¬ (rank‘(𝐴 × 𝐵)) = ∅ → (¬ (∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∧ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦) → (Lim (rank‘(𝐴𝐵)) ∨ Lim (rank‘(𝐴 × 𝐵)))))
104103imp 444 . . . 4 ((¬ (rank‘(𝐴 × 𝐵)) = ∅ ∧ ¬ (∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∧ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → (Lim (rank‘(𝐴𝐵)) ∨ Lim (rank‘(𝐴 × 𝐵))))
105 simpl 474 . . . . . . . 8 ((Lim (rank‘(𝐴𝐵)) ∧ ¬ (rank‘(𝐴 × 𝐵)) = ∅) → Lim (rank‘(𝐴𝐵)))
10634necon3abii 2978 . . . . . . . . . 10 ((𝐴 × 𝐵) ≠ ∅ ↔ ¬ (rank‘(𝐴 × 𝐵)) = ∅)
10719, 20rankxplim 8917 . . . . . . . . . 10 ((Lim (rank‘(𝐴𝐵)) ∧ (𝐴 × 𝐵) ≠ ∅) → (rank‘(𝐴 × 𝐵)) = (rank‘(𝐴𝐵)))
108106, 107sylan2br 494 . . . . . . . . 9 ((Lim (rank‘(𝐴𝐵)) ∧ ¬ (rank‘(𝐴 × 𝐵)) = ∅) → (rank‘(𝐴 × 𝐵)) = (rank‘(𝐴𝐵)))
109 limeq 5896 . . . . . . . . 9 ((rank‘(𝐴 × 𝐵)) = (rank‘(𝐴𝐵)) → (Lim (rank‘(𝐴 × 𝐵)) ↔ Lim (rank‘(𝐴𝐵))))
110108, 109syl 17 . . . . . . . 8 ((Lim (rank‘(𝐴𝐵)) ∧ ¬ (rank‘(𝐴 × 𝐵)) = ∅) → (Lim (rank‘(𝐴 × 𝐵)) ↔ Lim (rank‘(𝐴𝐵))))
111105, 110mpbird 247 . . . . . . 7 ((Lim (rank‘(𝐴𝐵)) ∧ ¬ (rank‘(𝐴 × 𝐵)) = ∅) → Lim (rank‘(𝐴 × 𝐵)))
112111expcom 450 . . . . . 6 (¬ (rank‘(𝐴 × 𝐵)) = ∅ → (Lim (rank‘(𝐴𝐵)) → Lim (rank‘(𝐴 × 𝐵))))
113 idd 24 . . . . . 6 (¬ (rank‘(𝐴 × 𝐵)) = ∅ → (Lim (rank‘(𝐴 × 𝐵)) → Lim (rank‘(𝐴 × 𝐵))))
114112, 113jaod 394 . . . . 5 (¬ (rank‘(𝐴 × 𝐵)) = ∅ → ((Lim (rank‘(𝐴𝐵)) ∨ Lim (rank‘(𝐴 × 𝐵))) → Lim (rank‘(𝐴 × 𝐵))))
115114adantr 472 . . . 4 ((¬ (rank‘(𝐴 × 𝐵)) = ∅ ∧ ¬ (∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∧ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → ((Lim (rank‘(𝐴𝐵)) ∨ Lim (rank‘(𝐴 × 𝐵))) → Lim (rank‘(𝐴 × 𝐵))))
116104, 115mpd 15 . . 3 ((¬ (rank‘(𝐴 × 𝐵)) = ∅ ∧ ¬ (∃𝑥 ∈ On (rank‘(𝐴𝐵)) = suc 𝑥 ∧ ∃𝑦 ∈ On (rank‘(𝐴 × 𝐵)) = suc 𝑦)) → Lim (rank‘(𝐴 × 𝐵)))
1178, 78, 116syl2anc 696 . 2 (Lim (rank‘(𝐴 × 𝐵)) → Lim (rank‘(𝐴 × 𝐵)))
1181, 117impbii 199 1 (Lim (rank‘(𝐴 × 𝐵)) ↔ Lim (rank‘(𝐴 × 𝐵)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wo 382  wa 383  w3o 1071   = wceq 1632  wcel 2139  wne 2932  wrex 3051  Vcvv 3340  cun 3713  wss 3715  c0 4058   cuni 4588   × cxp 5264  Ord word 5883  Oncon0 5884  Lim wlim 5885  suc csuc 5886  cfv 6049  rankcrnk 8801
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-8 2141  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-rep 4923  ax-sep 4933  ax-nul 4941  ax-pow 4992  ax-pr 5055  ax-un 7115  ax-reg 8664  ax-inf2 8713
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1073  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-ral 3055  df-rex 3056  df-reu 3057  df-rab 3059  df-v 3342  df-sbc 3577  df-csb 3675  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-pss 3731  df-nul 4059  df-if 4231  df-pw 4304  df-sn 4322  df-pr 4324  df-tp 4326  df-op 4328  df-uni 4589  df-int 4628  df-iun 4674  df-br 4805  df-opab 4865  df-mpt 4882  df-tr 4905  df-id 5174  df-eprel 5179  df-po 5187  df-so 5188  df-fr 5225  df-we 5227  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-rn 5277  df-res 5278  df-ima 5279  df-pred 5841  df-ord 5887  df-on 5888  df-lim 5889  df-suc 5890  df-iota 6012  df-fun 6051  df-fn 6052  df-f 6053  df-f1 6054  df-fo 6055  df-f1o 6056  df-fv 6057  df-om 7232  df-wrecs 7577  df-recs 7638  df-rdg 7676  df-r1 8802  df-rank 8803
This theorem is referenced by:  rankxpsuc  8920
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