Theorem ram0 15726

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 2622	. . 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 4790	. . . 4 ⊢ ∅ ∈ V
4	3	a1i 11	. . 3 ⊢ (𝑀 ∈ ℕ0 → ∅ ∈ V)
5		f0 6086	. . . 4 ⊢ ∅:∅⟶ℕ0
6	5	a1i 11	. . 3 ⊢ (𝑀 ∈ ℕ0 → ∅:∅⟶ℕ0)
7		f00 6087	. . . . 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 3203	. . . . . . . . . 10 ⊢ 𝑠 ∈ V
9		simpl 473	. . . . . . . . . 10 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → 𝑀 ∈ ℕ0)
10	1	hashbcval 15706	. . . . . . . . . 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 695	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → (𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀) = {𝑥 ∈ 𝒫 𝑠 ∣ (#‘𝑥) = 𝑀})
12		hashfz1 13134	. . . . . . . . . . . . . . . 16 ⊢ (𝑀 ∈ ℕ0 → (#‘(1...𝑀)) = 𝑀)
13	12	breq1d 4663	. . . . . . . . . . . . . . 15 ⊢ (𝑀 ∈ ℕ0 → ((#‘(1...𝑀)) ≤ (#‘𝑠) ↔ 𝑀 ≤ (#‘𝑠)))
14	13	biimpar 502	. . . . . . . . . . . . . 14 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → (#‘(1...𝑀)) ≤ (#‘𝑠))
15		fzfid 12772	. . . . . . . . . . . . . . 15 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → (1...𝑀) ∈ Fin)
16		hashdom 13168	. . . . . . . . . . . . . . 15 ⊢ (((1...𝑀) ∈ Fin ∧ 𝑠 ∈ V) → ((#‘(1...𝑀)) ≤ (#‘𝑠) ↔ (1...𝑀) ≼ 𝑠))
17	15, 8, 16	sylancl 694	. . . . . . . . . . . . . 14 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → ((#‘(1...𝑀)) ≤ (#‘𝑠) ↔ (1...𝑀) ≼ 𝑠))
18	14, 17	mpbid 222	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → (1...𝑀) ≼ 𝑠)
19	8	domen 7968	. . . . . . . . . . . . 13 ⊢ ((1...𝑀) ≼ 𝑠 ↔ ∃𝑥((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠))
20	18, 19	sylib 208	. . . . . . . . . . . 12 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → ∃𝑥((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠))
21		simprr 796	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → 𝑥 ⊆ 𝑠)
22		selpw 4165	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 ∈ 𝒫 𝑠 ↔ 𝑥 ⊆ 𝑠)
23	21, 22	sylibr 224	. . . . . . . . . . . . . . 15 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → 𝑥 ∈ 𝒫 𝑠)
24		hasheni 13136	. . . . . . . . . . . . . . . . 17 ⊢ ((1...𝑀) ≈ 𝑥 → (#‘(1...𝑀)) = (#‘𝑥))
25	24	ad2antrl 764	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (#‘(1...𝑀)) = (#‘𝑥))
26	12	ad2antrr 762	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (#‘(1...𝑀)) = 𝑀)
27	25, 26	eqtr3d 2658	. . . . . . . . . . . . . . 15 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (#‘𝑥) = 𝑀)
28	23, 27	jca 554	. . . . . . . . . . . . . 14 ⊢ (((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (𝑥 ∈ 𝒫 𝑠 ∧ (#‘𝑥) = 𝑀))
29	28	ex 450	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → (((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠) → (𝑥 ∈ 𝒫 𝑠 ∧ (#‘𝑥) = 𝑀)))
30	29	eximdv 1846	. . . . . . . . . . . 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 2918	. . . . . . . . . . 11 ⊢ (∃𝑥 ∈ 𝒫 𝑠(#‘𝑥) = 𝑀 ↔ ∃𝑥(𝑥 ∈ 𝒫 𝑠 ∧ (#‘𝑥) = 𝑀))
33	31, 32	sylibr 224	. . . . . . . . . 10 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → ∃𝑥 ∈ 𝒫 𝑠(#‘𝑥) = 𝑀)
34		rabn0 3958	. . . . . . . . . 10 ⊢ ({𝑥 ∈ 𝒫 𝑠 ∣ (#‘𝑥) = 𝑀} ≠ ∅ ↔ ∃𝑥 ∈ 𝒫 𝑠(#‘𝑥) = 𝑀)
35	33, 34	sylibr 224	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → {𝑥 ∈ 𝒫 𝑠 ∣ (#‘𝑥) = 𝑀} ≠ ∅)
36	11, 35	eqnetrd 2861	. . . . . . . 8 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → (𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀) ≠ ∅)
37	36	neneqd 2799	. . . . . . 7 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑀 ≤ (#‘𝑠)) → ¬ (𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀) = ∅)
38	37	pm2.21d 118	. . . . . 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 483	. . . . 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 232	. . . 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 649	. . 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 15717	. 2 ⊢ (𝑀 ∈ ℕ0 → (𝑀 Ramsey ∅) ≤ 𝑀)
43		nnnn0 11299	. . . . . 6 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℕ0)
44	3	a1i 11	. . . . . 6 ⊢ (𝑀 ∈ ℕ → ∅ ∈ V)
45	5	a1i 11	. . . . . 6 ⊢ (𝑀 ∈ ℕ → ∅:∅⟶ℕ0)
46		nnm1nn0 11334	. . . . . 6 ⊢ (𝑀 ∈ ℕ → (𝑀 − 1) ∈ ℕ0)
47		f0 6086	. . . . . . 7 ⊢ ∅:∅⟶∅
48		fzfid 12772	. . . . . . . . . . 11 ⊢ (𝑀 ∈ ℕ → (1...(𝑀 − 1)) ∈ Fin)
49	1	hashbc2 15710	. . . . . . . . . . 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 693	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℕ → (#‘((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)) = ((#‘(1...(𝑀 − 1)))C𝑀))
51		hashfz1 13134	. . . . . . . . . . . 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 6665	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℕ → ((#‘(1...(𝑀 − 1)))C𝑀) = ((𝑀 − 1)C𝑀))
54		nnz 11399	. . . . . . . . . . 11 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℤ)
55		nnre 11027	. . . . . . . . . . . . 13 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℝ)
56	55	ltm1d 10956	. . . . . . . . . . . 12 ⊢ (𝑀 ∈ ℕ → (𝑀 − 1) < 𝑀)
57	56	olcd 408	. . . . . . . . . . 11 ⊢ (𝑀 ∈ ℕ → (𝑀 < 0 ∨ (𝑀 − 1) < 𝑀))
58		bcval4 13094	. . . . . . . . . . 11 ⊢ (((𝑀 − 1) ∈ ℕ0 ∧ 𝑀 ∈ ℤ ∧ (𝑀 < 0 ∨ (𝑀 − 1) < 𝑀)) → ((𝑀 − 1)C𝑀) = 0)
59	46, 54, 57, 58	syl3anc 1326	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℕ → ((𝑀 − 1)C𝑀) = 0)
60	50, 53, 59	3eqtrd 2660	. . . . . . . . 9 ⊢ (𝑀 ∈ ℕ → (#‘((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)) = 0)
61		ovex 6678	. . . . . . . . . 10 ⊢ ((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀) ∈ V
62		hasheq0 13154	. . . . . . . . . 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 208	. . . . . . . 8 ⊢ (𝑀 ∈ ℕ → ((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀) = ∅)
65	64	feq2d 6031	. . . . . . 7 ⊢ (𝑀 ∈ ℕ → (∅:((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶∅ ↔ ∅:∅⟶∅))
66	47, 65	mpbiri 248	. . . . . 6 ⊢ (𝑀 ∈ ℕ → ∅:((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶∅)
67		noel 3919	. . . . . . . 8 ⊢ ¬ 𝑐 ∈ ∅
68	67	pm2.21i 116	. . . . . . 7 ⊢ (𝑐 ∈ ∅ → ((𝑥(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀) ⊆ (◡∅ “ {𝑐}) → (#‘𝑥) < (∅‘𝑐)))
69	68	ad2antrl 764	. . . . . 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 15723	. . . . 5 ⊢ (𝑀 ∈ ℕ → (𝑀 − 1) < (𝑀 Ramsey ∅))
71		ramubcl 15722	. . . . . . . 8 ⊢ (((𝑀 ∈ ℕ0 ∧ ∅ ∈ V ∧ ∅:∅⟶ℕ0) ∧ (𝑀 ∈ ℕ0 ∧ (𝑀 Ramsey ∅) ≤ 𝑀)) → (𝑀 Ramsey ∅) ∈ ℕ0)
72	2, 4, 6, 2, 42, 71	syl32anc 1334	. . . . . . 7 ⊢ (𝑀 ∈ ℕ0 → (𝑀 Ramsey ∅) ∈ ℕ0)
73	43, 72	syl 17	. . . . . 6 ⊢ (𝑀 ∈ ℕ → (𝑀 Ramsey ∅) ∈ ℕ0)
74		nn0lem1lt 11442	. . . . . 6 ⊢ ((𝑀 ∈ ℕ0 ∧ (𝑀 Ramsey ∅) ∈ ℕ0) → (𝑀 ≤ (𝑀 Ramsey ∅) ↔ (𝑀 − 1) < (𝑀 Ramsey ∅)))
75	43, 73, 74	syl2anc 693	. . . . 5 ⊢ (𝑀 ∈ ℕ → (𝑀 ≤ (𝑀 Ramsey ∅) ↔ (𝑀 − 1) < (𝑀 Ramsey ∅)))
76	70, 75	mpbird 247	. . . 4 ⊢ (𝑀 ∈ ℕ → 𝑀 ≤ (𝑀 Ramsey ∅))
77	76	a1i 11	. . 3 ⊢ (𝑀 ∈ ℕ0 → (𝑀 ∈ ℕ → 𝑀 ≤ (𝑀 Ramsey ∅)))
78	72	nn0ge0d 11354	. . . 4 ⊢ (𝑀 ∈ ℕ0 → 0 ≤ (𝑀 Ramsey ∅))
79		breq1 4656	. . . 4 ⊢ (𝑀 = 0 → (𝑀 ≤ (𝑀 Ramsey ∅) ↔ 0 ≤ (𝑀 Ramsey ∅)))
80	78, 79	syl5ibrcom 237	. . 3 ⊢ (𝑀 ∈ ℕ0 → (𝑀 = 0 → 𝑀 ≤ (𝑀 Ramsey ∅)))
81		elnn0 11294	. . . 4 ⊢ (𝑀 ∈ ℕ0 ↔ (𝑀 ∈ ℕ ∨ 𝑀 = 0))
82	81	biimpi 206	. . 3 ⊢ (𝑀 ∈ ℕ0 → (𝑀 ∈ ℕ ∨ 𝑀 = 0))
83	77, 80, 82	mpjaod 396	. 2 ⊢ (𝑀 ∈ ℕ0 → 𝑀 ≤ (𝑀 Ramsey ∅))
84	72	nn0red 11352	. . 3 ⊢ (𝑀 ∈ ℕ0 → (𝑀 Ramsey ∅) ∈ ℝ)
85		nn0re 11301	. . 3 ⊢ (𝑀 ∈ ℕ0 → 𝑀 ∈ ℝ)
86	84, 85	letri3d 10179	. 2 ⊢ (𝑀 ∈ ℕ0 → ((𝑀 Ramsey ∅) = 𝑀 ↔ ((𝑀 Ramsey ∅) ≤ 𝑀 ∧ 𝑀 ≤ (𝑀 Ramsey ∅))))
87	42, 83, 86	mpbir2and 957	1 ⊢ (𝑀 ∈ ℕ0 → (𝑀 Ramsey ∅) = 𝑀)

Syntax hints:   → wi 4   ↔ wb 196   ∨ wo 383   ∧ wa 384   = wceq 1483  ∃wex 1704   ∈ wcel 1990   ≠ wne 2794  ∃wrex 2913  {crab 2916  Vcvv 3200   ⊆ wss 3574  ∅c0 3915  𝒫 cpw 4158  {csn 4177   class class class wbr 4653  ^◡ccnv 5113   “ cima 5117  ⟶wf 5884  ‘cfv 5888  (class class class)co 6650   ↦ cmpt2 6652   ≈ cen 7952   ≼ cdom 7953  Fincfn 7955  0cc0 9936  1c1 9937   < clt 10074   ≤ cle 10075   − cmin 10266  ℕcn 11020  ℕ₀cn0 11292  ℤcz 11377  ...cfz 12326  Ccbc 13089  #chash 13117   Ramsey cram 15703

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-2o 7561  df-oadd 7564  df-er 7742  df-map 7859  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-sup 8348  df-inf 8349  df-card 8765  df-cda 8990  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-div 10685  df-nn 11021  df-n0 11293  df-xnn0 11364  df-z 11378  df-uz 11688  df-rp 11833  df-fz 12327  df-seq 12802  df-fac 13061  df-bc 13090  df-hash 13118  df-ram 15705

This theorem is referenced by:  0ramcl  15727  ramcl  15733