Theorem ram0 16357

Description: The Ramsey number when 𝑅 = ∅. (Contributed by Mario Carneiro, 22-Apr-2015.)

Assertion

Ref	Expression
ram0	⊢ (𝑀 ∈ ℕ0 → (𝑀 Ramsey ∅) = 𝑀)

Proof of Theorem ram0

Dummy variables 𝑏 𝑓 𝑐 𝑠 𝑥 𝑎 𝑖 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2821	. . 3 ⊢ (𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖}) = (𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})
2		id 22	. . 3 ⊢ (𝑀 ∈ ℕ0 → 𝑀 ∈ ℕ0)
3		0ex 5210	. . . 4 ⊢ ∅ ∈ V
4	3	a1i 11	. . 3 ⊢ (𝑀 ∈ ℕ0 → ∅ ∈ V)
5		f0 6559	. . . 4 ⊢ ∅:∅⟶ℕ0
6	5	a1i 11	. . 3 ⊢ (𝑀 ∈ ℕ0 → ∅:∅⟶ℕ0)
7		f00 6560	. . . . 5 ⊢ (𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)⟶∅ ↔ (𝑓 = ∅ ∧ (𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) = ∅))
8		vex 3497	. . . . . . . . . 10 ⊢ 𝑠 ∈ V
9		simpl 485	. . . . . . . . . 10 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → 𝑀 ∈ ℕ0)
10	1	hashbcval 16337	. . . . . . . . . 10 ⊢ ((𝑠 ∈ V ∧ 𝑀 ∈ ℕ0) → (𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) = {𝑥 ∈ 𝒫 𝑠 ∣ (♯‘𝑥) = 𝑀})
11	8, 9, 10	sylancr 589	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → (𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) = {𝑥 ∈ 𝒫 𝑠 ∣ (♯‘𝑥) = 𝑀})
12		hashfz1 13705	. . . . . . . . . . . . . . . 16 ⊢ (𝑀 ∈ ℕ0 → (♯‘(1...𝑀)) = 𝑀)
13	12	breq1d 5075	. . . . . . . . . . . . . . 15 ⊢ (𝑀 ∈ ℕ0 → ((♯‘(1...𝑀)) ≤ (♯‘𝑠) ↔ 𝑀 ≤ (♯‘𝑠)))
14	13	biimpar 480	. . . . . . . . . . . . . 14 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → (♯‘(1...𝑀)) ≤ (♯‘𝑠))
15		fzfid 13340	. . . . . . . . . . . . . . 15 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → (1...𝑀) ∈ Fin)
16		hashdom 13739	. . . . . . . . . . . . . . 15 ⊢ (((1...𝑀) ∈ Fin ∧ 𝑠 ∈ V) → ((♯‘(1...𝑀)) ≤ (♯‘𝑠) ↔ (1...𝑀) ≼ 𝑠))
17	15, 8, 16	sylancl 588	. . . . . . . . . . . . . 14 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → ((♯‘(1...𝑀)) ≤ (♯‘𝑠) ↔ (1...𝑀) ≼ 𝑠))
18	14, 17	mpbid 234	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → (1...𝑀) ≼ 𝑠)
19	8	domen 8521	. . . . . . . . . . . . 13 ⊢ ((1...𝑀) ≼ 𝑠 ↔ ∃𝑥((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠))
20	18, 19	sylib 220	. . . . . . . . . . . 12 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → ∃𝑥((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠))
21		simprr 771	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → 𝑥 ⊆ 𝑠)
22		velpw 4543	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 ∈ 𝒫 𝑠 ↔ 𝑥 ⊆ 𝑠)
23	21, 22	sylibr 236	. . . . . . . . . . . . . . 15 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → 𝑥 ∈ 𝒫 𝑠)
24		hasheni 13707	. . . . . . . . . . . . . . . . 17 ⊢ ((1...𝑀) ≈ 𝑥 → (♯‘(1...𝑀)) = (♯‘𝑥))
25	24	ad2antrl 726	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (♯‘(1...𝑀)) = (♯‘𝑥))
26	12	ad2antrr 724	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (♯‘(1...𝑀)) = 𝑀)
27	25, 26	eqtr3d 2858	. . . . . . . . . . . . . . 15 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (♯‘𝑥) = 𝑀)
28	23, 27	jca 514	. . . . . . . . . . . . . 14 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (𝑥 ∈ 𝒫 𝑠 ∧ (♯‘𝑥) = 𝑀))
29	28	ex 415	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → (((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠) → (𝑥 ∈ 𝒫 𝑠 ∧ (♯‘𝑥) = 𝑀)))
30	29	eximdv 1914	. . . . . . . . . . . 12 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → (∃𝑥((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠) → ∃𝑥(𝑥 ∈ 𝒫 𝑠 ∧ (♯‘𝑥) = 𝑀)))
31	20, 30	mpd 15	. . . . . . . . . . 11 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → ∃𝑥(𝑥 ∈ 𝒫 𝑠 ∧ (♯‘𝑥) = 𝑀))
32		df-rex 3144	. . . . . . . . . . 11 ⊢ (∃𝑥 ∈ 𝒫 𝑠(♯‘𝑥) = 𝑀 ↔ ∃𝑥(𝑥 ∈ 𝒫 𝑠 ∧ (♯‘𝑥) = 𝑀))
33	31, 32	sylibr 236	. . . . . . . . . 10 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → ∃𝑥 ∈ 𝒫 𝑠(♯‘𝑥) = 𝑀)
34		rabn0 4338	. . . . . . . . . 10 ⊢ ({𝑥 ∈ 𝒫 𝑠 ∣ (♯‘𝑥) = 𝑀} ≠ ∅ ↔ ∃𝑥 ∈ 𝒫 𝑠(♯‘𝑥) = 𝑀)
35	33, 34	sylibr 236	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → {𝑥 ∈ 𝒫 𝑠 ∣ (♯‘𝑥) = 𝑀} ≠ ∅)
36	11, 35	eqnetrd 3083	. . . . . . . 8 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → (𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) ≠ ∅)
37	36	neneqd 3021	. . . . . . 7 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → ¬ (𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) = ∅)
38	37	pm2.21d 121	. . . . . 6 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → ((𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) = ∅ → ∃𝑐 ∈ ∅ ∃𝑥 ∈ 𝒫 𝑠((∅‘𝑐) ≤ (♯‘𝑥) ∧ (𝑥(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) ⊆ (◡𝑓 “ {𝑐}))))
39	38	adantld 493	. . . . 5 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → ((𝑓 = ∅ ∧ (𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) = ∅) → ∃𝑐 ∈ ∅ ∃𝑥 ∈ 𝒫 𝑠((∅‘𝑐) ≤ (♯‘𝑥) ∧ (𝑥(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) ⊆ (◡𝑓 “ {𝑐}))))
40	7, 39	syl5bi 244	. . . 4 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (♯‘𝑠)) → (𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)⟶∅ → ∃𝑐 ∈ ∅ ∃𝑥 ∈ 𝒫 𝑠((∅‘𝑐) ≤ (♯‘𝑥) ∧ (𝑥(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) ⊆ (◡𝑓 “ {𝑐}))))
41	40	impr 457	. . 3 ⊢ ((𝑀 ∈ ℕ0 ∧ (𝑀 ≤ (♯‘𝑠) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)⟶∅)) → ∃𝑐 ∈ ∅ ∃𝑥 ∈ 𝒫 𝑠((∅‘𝑐) ≤ (♯‘𝑥) ∧ (𝑥(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) ⊆ (◡𝑓 “ {𝑐})))
42	1, 2, 4, 6, 2, 41	ramub 16348	. 2 ⊢ (𝑀 ∈ ℕ0 → (𝑀 Ramsey ∅) ≤ 𝑀)
43		nnnn0 11903	. . . . . 6 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℕ0)
44	3	a1i 11	. . . . . 6 ⊢ (𝑀 ∈ ℕ → ∅ ∈ V)
45	5	a1i 11	. . . . . 6 ⊢ (𝑀 ∈ ℕ → ∅:∅⟶ℕ0)
46		nnm1nn0 11937	. . . . . 6 ⊢ (𝑀 ∈ ℕ → (𝑀 − 1) ∈ ℕ0)
47		f0 6559	. . . . . . 7 ⊢ ∅:∅⟶∅
48		fzfid 13340	. . . . . . . . . . 11 ⊢ (𝑀 ∈ ℕ → (1...(𝑀 − 1)) ∈ Fin)
49	1	hashbc2 16341	. . . . . . . . . . 11 ⊢ (((1...(𝑀 − 1)) ∈ Fin ∧ 𝑀 ∈ ℕ0) → (♯‘((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)) = ((♯‘(1...(𝑀 − 1)))C𝑀))
50	48, 43, 49	syl2anc 586	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℕ → (♯‘((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)) = ((♯‘(1...(𝑀 − 1)))C𝑀))
51		hashfz1 13705	. . . . . . . . . . . 12 ⊢ ((𝑀 − 1) ∈ ℕ0 → (♯‘(1...(𝑀 − 1))) = (𝑀 − 1))
52	46, 51	syl 17	. . . . . . . . . . 11 ⊢ (𝑀 ∈ ℕ → (♯‘(1...(𝑀 − 1))) = (𝑀 − 1))
53	52	oveq1d 7170	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℕ → ((♯‘(1...(𝑀 − 1)))C𝑀) = ((𝑀 − 1)C𝑀))
54		nnz 12003	. . . . . . . . . . 11 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℤ)
55		nnre 11644	. . . . . . . . . . . . 13 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℝ)
56	55	ltm1d 11571	. . . . . . . . . . . 12 ⊢ (𝑀 ∈ ℕ → (𝑀 − 1) < 𝑀)
57	56	olcd 870	. . . . . . . . . . 11 ⊢ (𝑀 ∈ ℕ → (𝑀 < 0 ∨ (𝑀 − 1) < 𝑀))
58		bcval4 13666	. . . . . . . . . . 11 ⊢ (((𝑀 − 1) ∈ ℕ0 ∧ 𝑀 ∈ ℤ ∧ (𝑀 < 0 ∨ (𝑀 − 1) < 𝑀)) → ((𝑀 − 1)C𝑀) = 0)
59	46, 54, 57, 58	syl3anc 1367	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℕ → ((𝑀 − 1)C𝑀) = 0)
60	50, 53, 59	3eqtrd 2860	. . . . . . . . 9 ⊢ (𝑀 ∈ ℕ → (♯‘((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)) = 0)
61		ovex 7188	. . . . . . . . . 10 ⊢ ((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) ∈ V
62		hasheq0 13723	. . . . . . . . . 10 ⊢ (((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) ∈ V → ((♯‘((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)) = 0 ↔ ((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) = ∅))
63	61, 62	ax-mp 5	. . . . . . . . 9 ⊢ ((♯‘((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)) = 0 ↔ ((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) = ∅)
64	60, 63	sylib 220	. . . . . . . 8 ⊢ (𝑀 ∈ ℕ → ((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) = ∅)
65	64	feq2d 6499	. . . . . . 7 ⊢ (𝑀 ∈ ℕ → (∅:((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)⟶∅ ↔ ∅:∅⟶∅))
66	47, 65	mpbiri 260	. . . . . 6 ⊢ (𝑀 ∈ ℕ → ∅:((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)⟶∅)
67		noel 4295	. . . . . . . 8 ⊢ ¬ 𝑐 ∈ ∅
68	67	pm2.21i 119	. . . . . . 7 ⊢ (𝑐 ∈ ∅ → ((𝑥(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) ⊆ (◡∅ “ {𝑐}) → (♯‘𝑥) < (∅‘𝑐)))
69	68	ad2antrl 726	. . . . . 6 ⊢ ((𝑀 ∈ ℕ ∧ (𝑐 ∈ ∅ ∧ 𝑥 ⊆ (1...(𝑀 − 1)))) → ((𝑥(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) ⊆ (◡∅ “ {𝑐}) → (♯‘𝑥) < (∅‘𝑐)))
70	1, 43, 44, 45, 46, 66, 69	ramlb 16354	. . . . 5 ⊢ (𝑀 ∈ ℕ → (𝑀 − 1) < (𝑀 Ramsey ∅))
71		ramubcl 16353	. . . . . . 7 ⊢ (((𝑀 ∈ ℕ0 ∧ ∅ ∈ V ∧ ∅:∅⟶ℕ0) ∧ (𝑀 ∈ ℕ0 ∧ (𝑀 Ramsey ∅) ≤ 𝑀)) → (𝑀 Ramsey ∅) ∈ ℕ0)
72	2, 4, 6, 2, 42, 71	syl32anc 1374	. . . . . 6 ⊢ (𝑀 ∈ ℕ0 → (𝑀 Ramsey ∅) ∈ ℕ0)
73		nn0lem1lt 12046	. . . . . 6 ⊢ ((𝑀 ∈ ℕ0 ∧ (𝑀 Ramsey ∅) ∈ ℕ0) → (𝑀 ≤ (𝑀 Ramsey ∅) ↔ (𝑀 − 1) < (𝑀 Ramsey ∅)))
74	43, 72, 73	syl2anc2 587	. . . . 5 ⊢ (𝑀 ∈ ℕ → (𝑀 ≤ (𝑀 Ramsey ∅) ↔ (𝑀 − 1) < (𝑀 Ramsey ∅)))
75	70, 74	mpbird 259	. . . 4 ⊢ (𝑀 ∈ ℕ → 𝑀 ≤ (𝑀 Ramsey ∅))
76	75	a1i 11	. . 3 ⊢ (𝑀 ∈ ℕ0 → (𝑀 ∈ ℕ → 𝑀 ≤ (𝑀 Ramsey ∅)))
77	72	nn0ge0d 11957	. . . 4 ⊢ (𝑀 ∈ ℕ0 → 0 ≤ (𝑀 Ramsey ∅))
78		breq1 5068	. . . 4 ⊢ (𝑀 = 0 → (𝑀 ≤ (𝑀 Ramsey ∅) ↔ 0 ≤ (𝑀 Ramsey ∅)))
79	77, 78	syl5ibrcom 249	. . 3 ⊢ (𝑀 ∈ ℕ0 → (𝑀 = 0 → 𝑀 ≤ (𝑀 Ramsey ∅)))
80		elnn0 11898	. . . 4 ⊢ (𝑀 ∈ ℕ0 ↔ (𝑀 ∈ ℕ ∨ 𝑀 = 0))
81	80	biimpi 218	. . 3 ⊢ (𝑀 ∈ ℕ0 → (𝑀 ∈ ℕ ∨ 𝑀 = 0))
82	76, 79, 81	mpjaod 856	. 2 ⊢ (𝑀 ∈ ℕ0 → 𝑀 ≤ (𝑀 Ramsey ∅))
83	72	nn0red 11955	. . 3 ⊢ (𝑀 ∈ ℕ0 → (𝑀 Ramsey ∅) ∈ ℝ)
84		nn0re 11905	. . 3 ⊢ (𝑀 ∈ ℕ0 → 𝑀 ∈ ℝ)
85	83, 84	letri3d 10781	. 2 ⊢ (𝑀 ∈ ℕ0 → ((𝑀 Ramsey ∅) = 𝑀 ↔ ((𝑀 Ramsey ∅) ≤ 𝑀 ∧ 𝑀 ≤ (𝑀 Ramsey ∅))))
86	42, 82, 85	mpbir2and 711	1 ⊢ (𝑀 ∈ ℕ0 → (𝑀 Ramsey ∅) = 𝑀)

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   ∨ wo 843   = wceq 1533  ∃wex 1776   ∈ wcel 2110   ≠ wne 3016  ∃wrex 3139  {crab 3142  Vcvv 3494   ⊆ wss 3935  ∅c0 4290  𝒫 cpw 4538  {csn 4566   class class class wbr 5065  ^◡ccnv 5553   “ cima 5557  ⟶wf 6350  ‘cfv 6354  (class class class)co 7155   ∈ cmpo 7157   ≈ cen 8505   ≼ cdom 8506  Fincfn 8508  0cc0 10536  1c1 10537   < clt 10674   ≤ cle 10675   − cmin 10869  ℕcn 11637  ℕ₀cn0 11896  ℤcz 11980  ...cfz 12891  Ccbc 13661  ♯chash 13689   Ramsey cram 16334

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-rep 5189  ax-sep 5202  ax-nul 5209  ax-pow 5265  ax-pr 5329  ax-un 7460  ax-cnex 10592  ax-resscn 10593  ax-1cn 10594  ax-icn 10595  ax-addcl 10596  ax-addrcl 10597  ax-mulcl 10598  ax-mulrcl 10599  ax-mulcom 10600  ax-addass 10601  ax-mulass 10602  ax-distr 10603  ax-i2m1 10604  ax-1ne0 10605  ax-1rid 10606  ax-rnegex 10607  ax-rrecex 10608  ax-cnre 10609  ax-pre-lttri 10610  ax-pre-lttrn 10611  ax-pre-ltadd 10612  ax-pre-mulgt0 10613

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-nel 3124  df-ral 3143  df-rex 3144  df-reu 3145  df-rmo 3146  df-rab 3147  df-v 3496  df-sbc 3772  df-csb 3883  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-pss 3953  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4567  df-pr 4569  df-tp 4571  df-op 4573  df-uni 4838  df-int 4876  df-iun 4920  df-br 5066  df-opab 5128  df-mpt 5146  df-tr 5172  df-id 5459  df-eprel 5464  df-po 5473  df-so 5474  df-fr 5513  df-we 5515  df-xp 5560  df-rel 5561  df-cnv 5562  df-co 5563  df-dm 5564  df-rn 5565  df-res 5566  df-ima 5567  df-pred 6147  df-ord 6193  df-on 6194  df-lim 6195  df-suc 6196  df-iota 6313  df-fun 6356  df-fn 6357  df-f 6358  df-f1 6359  df-fo 6360  df-f1o 6361  df-fv 6362  df-riota 7113  df-ov 7158  df-oprab 7159  df-mpo 7160  df-om 7580  df-1st 7688  df-2nd 7689  df-wrecs 7946  df-recs 8007  df-rdg 8045  df-1o 8101  df-2o 8102  df-oadd 8105  df-er 8288  df-map 8407  df-en 8509  df-dom 8510  df-sdom 8511  df-fin 8512  df-sup 8905  df-inf 8906  df-dju 9329  df-card 9367  df-pnf 10676  df-mnf 10677  df-xr 10678  df-ltxr 10679  df-le 10680  df-sub 10871  df-neg 10872  df-div 11297  df-nn 11638  df-n0 11897  df-xnn0 11967  df-z 11981  df-uz 12243  df-rp 12389  df-fz 12892  df-seq 13369  df-fac 13633  df-bc 13662  df-hash 13690  df-ram 16336

This theorem is referenced by:  0ramcl  16358  ramcl  16364