Theorem cfcoflem 10263

Description: Lemma for cfcof 10265, showing subset relation in one direction. (Contributed by Mario Carneiro, 9-Mar-2013.) (Revised by Mario Carneiro, 26-Dec-2014.)

Assertion

Ref	Expression
cfcoflem	⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (∃𝑓(𝑓:𝐵⟶𝐴 ∧ Smo 𝑓 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦)) → (cf‘𝐴) ⊆ (cf‘𝐵)))

Distinct variable groups:   𝐴,𝑓,𝑥,𝑦   𝐵,𝑓,𝑥,𝑦

Proof of Theorem cfcoflem

Dummy variables 𝑔 ℎ 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		cff1 10249	. . 3 ⊢ (𝐵 ∈ On → ∃𝑔(𝑔:(cf‘𝐵)–1-1→𝐵 ∧ ∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧)))
2		f1f 6784	. . . . . 6 ⊢ (𝑔:(cf‘𝐵)–1-1→𝐵 → 𝑔:(cf‘𝐵)⟶𝐵)
3		fco 6738	. . . . . . . . . . . . 13 ⊢ ((𝑓:𝐵⟶𝐴 ∧ 𝑔:(cf‘𝐵)⟶𝐵) → (𝑓 ∘ 𝑔):(cf‘𝐵)⟶𝐴)
4	3	adantlr 713	. . . . . . . . . . . 12 ⊢ (((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) → (𝑓 ∘ 𝑔):(cf‘𝐵)⟶𝐴)
5		r19.29 3114	. . . . . . . . . . . . . . . 16 ⊢ ((∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) ∧ ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦)) → ∃𝑦 ∈ 𝐵 (∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) ∧ 𝑥 ⊆ (𝑓‘𝑦)))
6		ffvelcdm 7080	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ⊢ ((𝑔:(cf‘𝐵)⟶𝐵 ∧ 𝑧 ∈ (cf‘𝐵)) → (𝑔‘𝑧) ∈ 𝐵)
7		ffn 6714	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ⊢ (𝑓:𝐵⟶𝐴 → 𝑓 Fn 𝐵)
8		smoword 8362	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 ⊢ (((𝑓 Fn 𝐵 ∧ Smo 𝑓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑔‘𝑧) ∈ 𝐵)) → (𝑦 ⊆ (𝑔‘𝑧) ↔ (𝑓‘𝑦) ⊆ (𝑓‘(𝑔‘𝑧))))
9	8	biimpd 228	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 ⊢ (((𝑓 Fn 𝐵 ∧ Smo 𝑓) ∧ (𝑦 ∈ 𝐵 ∧ (𝑔‘𝑧) ∈ 𝐵)) → (𝑦 ⊆ (𝑔‘𝑧) → (𝑓‘𝑦) ⊆ (𝑓‘(𝑔‘𝑧))))
10	9	exp32 421	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ⊢ ((𝑓 Fn 𝐵 ∧ Smo 𝑓) → (𝑦 ∈ 𝐵 → ((𝑔‘𝑧) ∈ 𝐵 → (𝑦 ⊆ (𝑔‘𝑧) → (𝑓‘𝑦) ⊆ (𝑓‘(𝑔‘𝑧))))))
11	7, 10	sylan 580	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ⊢ ((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) → (𝑦 ∈ 𝐵 → ((𝑔‘𝑧) ∈ 𝐵 → (𝑦 ⊆ (𝑔‘𝑧) → (𝑓‘𝑦) ⊆ (𝑓‘(𝑔‘𝑧))))))
12	6, 11	syl7 74	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ⊢ ((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) → (𝑦 ∈ 𝐵 → ((𝑔:(cf‘𝐵)⟶𝐵 ∧ 𝑧 ∈ (cf‘𝐵)) → (𝑦 ⊆ (𝑔‘𝑧) → (𝑓‘𝑦) ⊆ (𝑓‘(𝑔‘𝑧))))))
13	12	com23 86	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ⊢ ((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) → ((𝑔:(cf‘𝐵)⟶𝐵 ∧ 𝑧 ∈ (cf‘𝐵)) → (𝑦 ∈ 𝐵 → (𝑦 ⊆ (𝑔‘𝑧) → (𝑓‘𝑦) ⊆ (𝑓‘(𝑔‘𝑧))))))
14	13	expdimp 453	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ⊢ (((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) → (𝑧 ∈ (cf‘𝐵) → (𝑦 ∈ 𝐵 → (𝑦 ⊆ (𝑔‘𝑧) → (𝑓‘𝑦) ⊆ (𝑓‘(𝑔‘𝑧))))))
15	14	3imp2 1349	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ ((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ (𝑧 ∈ (cf‘𝐵) ∧ 𝑦 ∈ 𝐵 ∧ 𝑦 ⊆ (𝑔‘𝑧))) → (𝑓‘𝑦) ⊆ (𝑓‘(𝑔‘𝑧)))
16		sstr2 3988	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ (𝑥 ⊆ (𝑓‘𝑦) → ((𝑓‘𝑦) ⊆ (𝑓‘(𝑔‘𝑧)) → 𝑥 ⊆ (𝑓‘(𝑔‘𝑧))))
17	15, 16	syl5com 31	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ ((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ (𝑧 ∈ (cf‘𝐵) ∧ 𝑦 ∈ 𝐵 ∧ 𝑦 ⊆ (𝑔‘𝑧))) → (𝑥 ⊆ (𝑓‘𝑦) → 𝑥 ⊆ (𝑓‘(𝑔‘𝑧))))
18		fvco3 6987	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ⊢ ((𝑔:(cf‘𝐵)⟶𝐵 ∧ 𝑧 ∈ (cf‘𝐵)) → ((𝑓 ∘ 𝑔)‘𝑧) = (𝑓‘(𝑔‘𝑧)))
19	18	sseq2d 4013	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ⊢ ((𝑔:(cf‘𝐵)⟶𝐵 ∧ 𝑧 ∈ (cf‘𝐵)) → (𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧) ↔ 𝑥 ⊆ (𝑓‘(𝑔‘𝑧))))
20	19	adantll 712	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ ((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ 𝑧 ∈ (cf‘𝐵)) → (𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧) ↔ 𝑥 ⊆ (𝑓‘(𝑔‘𝑧))))
21	20	3ad2antr1 1188	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ ((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ (𝑧 ∈ (cf‘𝐵) ∧ 𝑦 ∈ 𝐵 ∧ 𝑦 ⊆ (𝑔‘𝑧))) → (𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧) ↔ 𝑥 ⊆ (𝑓‘(𝑔‘𝑧))))
22	17, 21	sylibrd 258	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ ((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ (𝑧 ∈ (cf‘𝐵) ∧ 𝑦 ∈ 𝐵 ∧ 𝑦 ⊆ (𝑔‘𝑧))) → (𝑥 ⊆ (𝑓‘𝑦) → 𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))
23	22	expcom 414	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ ((𝑧 ∈ (cf‘𝐵) ∧ 𝑦 ∈ 𝐵 ∧ 𝑦 ⊆ (𝑔‘𝑧)) → (((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) → (𝑥 ⊆ (𝑓‘𝑦) → 𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧))))
24	23	3expia 1121	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ ((𝑧 ∈ (cf‘𝐵) ∧ 𝑦 ∈ 𝐵) → (𝑦 ⊆ (𝑔‘𝑧) → (((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) → (𝑥 ⊆ (𝑓‘𝑦) → 𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))))
25	24	com4t 93	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) → (𝑥 ⊆ (𝑓‘𝑦) → ((𝑧 ∈ (cf‘𝐵) ∧ 𝑦 ∈ 𝐵) → (𝑦 ⊆ (𝑔‘𝑧) → 𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))))
26	25	imp 407	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ 𝑥 ⊆ (𝑓‘𝑦)) → ((𝑧 ∈ (cf‘𝐵) ∧ 𝑦 ∈ 𝐵) → (𝑦 ⊆ (𝑔‘𝑧) → 𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧))))
27	26	expcomd 417	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ 𝑥 ⊆ (𝑓‘𝑦)) → (𝑦 ∈ 𝐵 → (𝑧 ∈ (cf‘𝐵) → (𝑦 ⊆ (𝑔‘𝑧) → 𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))))
28	27	imp31 418	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ 𝑥 ⊆ (𝑓‘𝑦)) ∧ 𝑦 ∈ 𝐵) ∧ 𝑧 ∈ (cf‘𝐵)) → (𝑦 ⊆ (𝑔‘𝑧) → 𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))
29	28	reximdva 3168	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ 𝑥 ⊆ (𝑓‘𝑦)) ∧ 𝑦 ∈ 𝐵) → (∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) → ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))
30	29	exp31 420	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) → (𝑥 ⊆ (𝑓‘𝑦) → (𝑦 ∈ 𝐵 → (∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) → ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))))
31	30	com34 91	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) → (𝑥 ⊆ (𝑓‘𝑦) → (∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) → (𝑦 ∈ 𝐵 → ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))))
32	31	impcomd 412	. . . . . . . . . . . . . . . . . 18 ⊢ (((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) → ((∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) ∧ 𝑥 ⊆ (𝑓‘𝑦)) → (𝑦 ∈ 𝐵 → ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧))))
33	32	com23 86	. . . . . . . . . . . . . . . . 17 ⊢ (((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) → (𝑦 ∈ 𝐵 → ((∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) ∧ 𝑥 ⊆ (𝑓‘𝑦)) → ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧))))
34	33	rexlimdv 3153	. . . . . . . . . . . . . . . 16 ⊢ (((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) → (∃𝑦 ∈ 𝐵 (∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) ∧ 𝑥 ⊆ (𝑓‘𝑦)) → ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))
35	5, 34	syl5 34	. . . . . . . . . . . . . . 15 ⊢ (((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) → ((∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) ∧ ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦)) → ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))
36	35	expdimp 453	. . . . . . . . . . . . . 14 ⊢ ((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ ∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧)) → (∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦) → ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))
37	36	ralimdv 3169	. . . . . . . . . . . . 13 ⊢ ((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ ∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧)) → (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦) → ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))
38	37	impr 455	. . . . . . . . . . . 12 ⊢ ((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ (∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦))) → ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧))
39		vex 3478	. . . . . . . . . . . . . 14 ⊢ 𝑓 ∈ V
40		vex 3478	. . . . . . . . . . . . . 14 ⊢ 𝑔 ∈ V
41	39, 40	coex 7917	. . . . . . . . . . . . 13 ⊢ (𝑓 ∘ 𝑔) ∈ V
42		feq1 6695	. . . . . . . . . . . . . 14 ⊢ (ℎ = (𝑓 ∘ 𝑔) → (ℎ:(cf‘𝐵)⟶𝐴 ↔ (𝑓 ∘ 𝑔):(cf‘𝐵)⟶𝐴))
43		fveq1 6887	. . . . . . . . . . . . . . . . 17 ⊢ (ℎ = (𝑓 ∘ 𝑔) → (ℎ‘𝑧) = ((𝑓 ∘ 𝑔)‘𝑧))
44	43	sseq2d 4013	. . . . . . . . . . . . . . . 16 ⊢ (ℎ = (𝑓 ∘ 𝑔) → (𝑥 ⊆ (ℎ‘𝑧) ↔ 𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))
45	44	rexbidv 3178	. . . . . . . . . . . . . . 15 ⊢ (ℎ = (𝑓 ∘ 𝑔) → (∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧) ↔ ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))
46	45	ralbidv 3177	. . . . . . . . . . . . . 14 ⊢ (ℎ = (𝑓 ∘ 𝑔) → (∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧) ↔ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)))
47	42, 46	anbi12d 631	. . . . . . . . . . . . 13 ⊢ (ℎ = (𝑓 ∘ 𝑔) → ((ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧)) ↔ ((𝑓 ∘ 𝑔):(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧))))
48	41, 47	spcev 3596	. . . . . . . . . . . 12 ⊢ (((𝑓 ∘ 𝑔):(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ ((𝑓 ∘ 𝑔)‘𝑧)) → ∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧)))
49	4, 38, 48	syl2an2r 683	. . . . . . . . . . 11 ⊢ ((((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) ∧ 𝑔:(cf‘𝐵)⟶𝐵) ∧ (∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦))) → ∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧)))
50	49	exp43 437	. . . . . . . . . 10 ⊢ ((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) → (𝑔:(cf‘𝐵)⟶𝐵 → (∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) → (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦) → ∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧))))))
51	50	com24 95	. . . . . . . . 9 ⊢ ((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓) → (∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦) → (∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) → (𝑔:(cf‘𝐵)⟶𝐵 → ∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧))))))
52	51	3impia 1117	. . . . . . . 8 ⊢ ((𝑓:𝐵⟶𝐴 ∧ Smo 𝑓 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦)) → (∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) → (𝑔:(cf‘𝐵)⟶𝐵 → ∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧)))))
53	52	exlimiv 1933	. . . . . . 7 ⊢ (∃𝑓(𝑓:𝐵⟶𝐴 ∧ Smo 𝑓 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦)) → (∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) → (𝑔:(cf‘𝐵)⟶𝐵 → ∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧)))))
54	53	com13 88	. . . . . 6 ⊢ (𝑔:(cf‘𝐵)⟶𝐵 → (∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) → (∃𝑓(𝑓:𝐵⟶𝐴 ∧ Smo 𝑓 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦)) → ∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧)))))
55	2, 54	syl 17	. . . . 5 ⊢ (𝑔:(cf‘𝐵)–1-1→𝐵 → (∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧) → (∃𝑓(𝑓:𝐵⟶𝐴 ∧ Smo 𝑓 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦)) → ∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧)))))
56	55	imp 407	. . . 4 ⊢ ((𝑔:(cf‘𝐵)–1-1→𝐵 ∧ ∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧)) → (∃𝑓(𝑓:𝐵⟶𝐴 ∧ Smo 𝑓 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦)) → ∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧))))
57	56	exlimiv 1933	. . 3 ⊢ (∃𝑔(𝑔:(cf‘𝐵)–1-1→𝐵 ∧ ∀𝑦 ∈ 𝐵 ∃𝑧 ∈ (cf‘𝐵)𝑦 ⊆ (𝑔‘𝑧)) → (∃𝑓(𝑓:𝐵⟶𝐴 ∧ Smo 𝑓 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦)) → ∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧))))
58	1, 57	syl 17	. 2 ⊢ (𝐵 ∈ On → (∃𝑓(𝑓:𝐵⟶𝐴 ∧ Smo 𝑓 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦)) → ∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧))))
59		cfon 10246	. . 3 ⊢ (cf‘𝐵) ∈ On
60		cfflb 10250	. . 3 ⊢ ((𝐴 ∈ On ∧ (cf‘𝐵) ∈ On) → (∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧)) → (cf‘𝐴) ⊆ (cf‘𝐵)))
61	59, 60	mpan2 689	. 2 ⊢ (𝐴 ∈ On → (∃ℎ(ℎ:(cf‘𝐵)⟶𝐴 ∧ ∀𝑥 ∈ 𝐴 ∃𝑧 ∈ (cf‘𝐵)𝑥 ⊆ (ℎ‘𝑧)) → (cf‘𝐴) ⊆ (cf‘𝐵)))
62	58, 61	sylan9r 509	1 ⊢ ((𝐴 ∈ On ∧ 𝐵 ∈ On) → (∃𝑓(𝑓:𝐵⟶𝐴 ∧ Smo 𝑓 ∧ ∀𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝑥 ⊆ (𝑓‘𝑦)) → (cf‘𝐴) ⊆ (cf‘𝐵)))

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 396   ∧ w3a 1087   = wceq 1541  ∃wex 1781   ∈ wcel 2106  ∀wral 3061  ∃wrex 3070   ⊆ wss 3947   ∘ ccom 5679  Oncon0 6361   Fn wfn 6535  ⟶wf 6536  –1-1→wf1 6537  ‘cfv 6540  Smo wsmo 8341  cfccf 9928

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-rep 5284  ax-sep 5298  ax-nul 5305  ax-pow 5362  ax-pr 5426  ax-un 7721

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3or 1088  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-eu 2563  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ne 2941  df-ral 3062  df-rex 3071  df-rmo 3376  df-reu 3377  df-rab 3433  df-v 3476  df-sbc 3777  df-csb 3893  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-pss 3966  df-nul 4322  df-if 4528  df-pw 4603  df-sn 4628  df-pr 4630  df-op 4634  df-uni 4908  df-int 4950  df-iun 4998  df-br 5148  df-opab 5210  df-mpt 5231  df-tr 5265  df-id 5573  df-eprel 5579  df-po 5587  df-so 5588  df-fr 5630  df-se 5631  df-we 5632  df-xp 5681  df-rel 5682  df-cnv 5683  df-co 5684  df-dm 5685  df-rn 5686  df-res 5687  df-ima 5688  df-pred 6297  df-ord 6364  df-on 6365  df-suc 6367  df-iota 6492  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-fo 6546  df-f1o 6547  df-fv 6548  df-isom 6549  df-riota 7361  df-ov 7408  df-oprab 7409  df-mpo 7410  df-1st 7971  df-2nd 7972  df-frecs 8262  df-wrecs 8293  df-smo 8342  df-recs 8367  df-er 8699  df-map 8818  df-en 8936  df-dom 8937  df-sdom 8938  df-card 9930  df-cf 9932  df-acn 9933

This theorem is referenced by:  cfcof  10265  cfidm  10266