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Theorem ram0 16961

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 2730	. . 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 5308	. . . 4 ⊢ ∅ ∈ V
4	3	a1i 11	. . 3 ⊢ (𝑀 ∈ ℕ₀ → ∅ ∈ V)
5		f0 6773	. . . 4 ⊢ ∅:∅⟶ℕ₀
6	5	a1i 11	. . 3 ⊢ (𝑀 ∈ ℕ₀ → ∅:∅⟶ℕ₀)
7		f00 6774	. . . . 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 3476	. . . . . . . . . 10 ⊢ 𝑠 ∈ V
9		simpl 481	. . . . . . . . . 10 ⊢ ((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) → 𝑀 ∈ ℕ₀)
10	1	hashbcval 16941	. . . . . . . . . 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 585	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) → (𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ₀ ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) = {𝑥 ∈ 𝒫 𝑠 ∣ (♯‘𝑥) = 𝑀})
12		hashfz1 14312	. . . . . . . . . . . . . . . 16 ⊢ (𝑀 ∈ ℕ₀ → (♯‘(1...𝑀)) = 𝑀)
13	12	breq1d 5159	. . . . . . . . . . . . . . 15 ⊢ (𝑀 ∈ ℕ₀ → ((♯‘(1...𝑀)) ≤ (♯‘𝑠) ↔ 𝑀 ≤ (♯‘𝑠)))
14	13	biimpar 476	. . . . . . . . . . . . . 14 ⊢ ((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) → (♯‘(1...𝑀)) ≤ (♯‘𝑠))
15		fzfid 13944	. . . . . . . . . . . . . . 15 ⊢ ((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) → (1...𝑀) ∈ Fin)
16		hashdom 14345	. . . . . . . . . . . . . . 15 ⊢ (((1...𝑀) ∈ Fin ∧ 𝑠 ∈ V) → ((♯‘(1...𝑀)) ≤ (♯‘𝑠) ↔ (1...𝑀) ≼ 𝑠))
17	15, 8, 16	sylancl 584	. . . . . . . . . . . . . 14 ⊢ ((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) → ((♯‘(1...𝑀)) ≤ (♯‘𝑠) ↔ (1...𝑀) ≼ 𝑠))
18	14, 17	mpbid 231	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) → (1...𝑀) ≼ 𝑠)
19	8	domen 8961	. . . . . . . . . . . . 13 ⊢ ((1...𝑀) ≼ 𝑠 ↔ ∃𝑥((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠))
20	18, 19	sylib 217	. . . . . . . . . . . 12 ⊢ ((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) → ∃𝑥((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠))
21		simprr 769	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → 𝑥 ⊆ 𝑠)
22		velpw 4608	. . . . . . . . . . . . . . . 16 ⊢ (𝑥 ∈ 𝒫 𝑠 ↔ 𝑥 ⊆ 𝑠)
23	21, 22	sylibr 233	. . . . . . . . . . . . . . 15 ⊢ (((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → 𝑥 ∈ 𝒫 𝑠)
24		hasheni 14314	. . . . . . . . . . . . . . . . 17 ⊢ ((1...𝑀) ≈ 𝑥 → (♯‘(1...𝑀)) = (♯‘𝑥))
25	24	ad2antrl 724	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (♯‘(1...𝑀)) = (♯‘𝑥))
26	12	ad2antrr 722	. . . . . . . . . . . . . . . 16 ⊢ (((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (♯‘(1...𝑀)) = 𝑀)
27	25, 26	eqtr3d 2772	. . . . . . . . . . . . . . 15 ⊢ (((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (♯‘𝑥) = 𝑀)
28	23, 27	jca 510	. . . . . . . . . . . . . 14 ⊢ (((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) ∧ ((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠)) → (𝑥 ∈ 𝒫 𝑠 ∧ (♯‘𝑥) = 𝑀))
29	28	ex 411	. . . . . . . . . . . . 13 ⊢ ((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) → (((1...𝑀) ≈ 𝑥 ∧ 𝑥 ⊆ 𝑠) → (𝑥 ∈ 𝒫 𝑠 ∧ (♯‘𝑥) = 𝑀)))
30	29	eximdv 1918	. . . . . . . . . . . 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 3069	. . . . . . . . . . 11 ⊢ (∃𝑥 ∈ 𝒫 𝑠(♯‘𝑥) = 𝑀 ↔ ∃𝑥(𝑥 ∈ 𝒫 𝑠 ∧ (♯‘𝑥) = 𝑀))
33	31, 32	sylibr 233	. . . . . . . . . 10 ⊢ ((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) → ∃𝑥 ∈ 𝒫 𝑠(♯‘𝑥) = 𝑀)
34		rabn0 4386	. . . . . . . . . 10 ⊢ ({𝑥 ∈ 𝒫 𝑠 ∣ (♯‘𝑥) = 𝑀} ≠ ∅ ↔ ∃𝑥 ∈ 𝒫 𝑠(♯‘𝑥) = 𝑀)
35	33, 34	sylibr 233	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) → {𝑥 ∈ 𝒫 𝑠 ∣ (♯‘𝑥) = 𝑀} ≠ ∅)
36	11, 35	eqnetrd 3006	. . . . . . . 8 ⊢ ((𝑀 ∈ ℕ₀ ∧ 𝑀 ≤ (♯‘𝑠)) → (𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ₀ ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) ≠ ∅)
37	36	neneqd 2943	. . . . . . 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 489	. . . . 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	biimtrid 241	. . . 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 453	. . 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 16952	. 2 ⊢ (𝑀 ∈ ℕ₀ → (𝑀 Ramsey ∅) ≤ 𝑀)
43		nnnn0 12485	. . . . . 6 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℕ₀)
44	3	a1i 11	. . . . . 6 ⊢ (𝑀 ∈ ℕ → ∅ ∈ V)
45	5	a1i 11	. . . . . 6 ⊢ (𝑀 ∈ ℕ → ∅:∅⟶ℕ₀)
46		nnm1nn0 12519	. . . . . 6 ⊢ (𝑀 ∈ ℕ → (𝑀 − 1) ∈ ℕ₀)
47		f0 6773	. . . . . . 7 ⊢ ∅:∅⟶∅
48		fzfid 13944	. . . . . . . . . . 11 ⊢ (𝑀 ∈ ℕ → (1...(𝑀 − 1)) ∈ Fin)
49	1	hashbc2 16945	. . . . . . . . . . 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 582	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℕ → (♯‘((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ₀ ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)) = ((♯‘(1...(𝑀 − 1)))C𝑀))
51		hashfz1 14312	. . . . . . . . . . . 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 7428	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℕ → ((♯‘(1...(𝑀 − 1)))C𝑀) = ((𝑀 − 1)C𝑀))
54		nnz 12585	. . . . . . . . . . 11 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℤ)
55		nnre 12225	. . . . . . . . . . . . 13 ⊢ (𝑀 ∈ ℕ → 𝑀 ∈ ℝ)
56	55	ltm1d 12152	. . . . . . . . . . . 12 ⊢ (𝑀 ∈ ℕ → (𝑀 − 1) < 𝑀)
57	56	olcd 870	. . . . . . . . . . 11 ⊢ (𝑀 ∈ ℕ → (𝑀 < 0 ∨ (𝑀 − 1) < 𝑀))
58		bcval4 14273	. . . . . . . . . . 11 ⊢ (((𝑀 − 1) ∈ ℕ₀ ∧ 𝑀 ∈ ℤ ∧ (𝑀 < 0 ∨ (𝑀 − 1) < 𝑀)) → ((𝑀 − 1)C𝑀) = 0)
59	46, 54, 57, 58	syl3anc 1369	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℕ → ((𝑀 − 1)C𝑀) = 0)
60	50, 53, 59	3eqtrd 2774	. . . . . . . . 9 ⊢ (𝑀 ∈ ℕ → (♯‘((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ₀ ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)) = 0)
61		ovex 7446	. . . . . . . . . 10 ⊢ ((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ₀ ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) ∈ V
62		hasheq0 14329	. . . . . . . . . 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 217	. . . . . . . 8 ⊢ (𝑀 ∈ ℕ → ((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ₀ ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀) = ∅)
65	64	feq2d 6704	. . . . . . 7 ⊢ (𝑀 ∈ ℕ → (∅:((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ₀ ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)⟶∅ ↔ ∅:∅⟶∅))
66	47, 65	mpbiri 257	. . . . . 6 ⊢ (𝑀 ∈ ℕ → ∅:((1...(𝑀 − 1))(𝑎 ∈ V, 𝑖 ∈ ℕ₀ ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (♯‘𝑏) = 𝑖})𝑀)⟶∅)
67		noel 4331	. . . . . . . 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 724	. . . . . 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 16958	. . . . 5 ⊢ (𝑀 ∈ ℕ → (𝑀 − 1) < (𝑀 Ramsey ∅))
71		ramubcl 16957	. . . . . . 7 ⊢ (((𝑀 ∈ ℕ₀ ∧ ∅ ∈ V ∧ ∅:∅⟶ℕ₀) ∧ (𝑀 ∈ ℕ₀ ∧ (𝑀 Ramsey ∅) ≤ 𝑀)) → (𝑀 Ramsey ∅) ∈ ℕ₀)
72	2, 4, 6, 2, 42, 71	syl32anc 1376	. . . . . 6 ⊢ (𝑀 ∈ ℕ₀ → (𝑀 Ramsey ∅) ∈ ℕ₀)
73		nn0lem1lt 12633	. . . . . 6 ⊢ ((𝑀 ∈ ℕ₀ ∧ (𝑀 Ramsey ∅) ∈ ℕ₀) → (𝑀 ≤ (𝑀 Ramsey ∅) ↔ (𝑀 − 1) < (𝑀 Ramsey ∅)))
74	43, 72, 73	syl2anc2 583	. . . . 5 ⊢ (𝑀 ∈ ℕ → (𝑀 ≤ (𝑀 Ramsey ∅) ↔ (𝑀 − 1) < (𝑀 Ramsey ∅)))
75	70, 74	mpbird 256	. . . 4 ⊢ (𝑀 ∈ ℕ → 𝑀 ≤ (𝑀 Ramsey ∅))
76	75	a1i 11	. . 3 ⊢ (𝑀 ∈ ℕ₀ → (𝑀 ∈ ℕ → 𝑀 ≤ (𝑀 Ramsey ∅)))
77	72	nn0ge0d 12541	. . . 4 ⊢ (𝑀 ∈ ℕ₀ → 0 ≤ (𝑀 Ramsey ∅))
78		breq1 5152	. . . 4 ⊢ (𝑀 = 0 → (𝑀 ≤ (𝑀 Ramsey ∅) ↔ 0 ≤ (𝑀 Ramsey ∅)))
79	77, 78	syl5ibrcom 246	. . 3 ⊢ (𝑀 ∈ ℕ₀ → (𝑀 = 0 → 𝑀 ≤ (𝑀 Ramsey ∅)))
80		elnn0 12480	. . . 4 ⊢ (𝑀 ∈ ℕ₀ ↔ (𝑀 ∈ ℕ ∨ 𝑀 = 0))
81	80	biimpi 215	. . 3 ⊢ (𝑀 ∈ ℕ₀ → (𝑀 ∈ ℕ ∨ 𝑀 = 0))
82	76, 79, 81	mpjaod 856	. 2 ⊢ (𝑀 ∈ ℕ₀ → 𝑀 ≤ (𝑀 Ramsey ∅))
83	72	nn0red 12539	. . 3 ⊢ (𝑀 ∈ ℕ₀ → (𝑀 Ramsey ∅) ∈ ℝ)
84		nn0re 12487	. . 3 ⊢ (𝑀 ∈ ℕ₀ → 𝑀 ∈ ℝ)
85	83, 84	letri3d 11362	. 2 ⊢ (𝑀 ∈ ℕ₀ → ((𝑀 Ramsey ∅) = 𝑀 ↔ ((𝑀 Ramsey ∅) ≤ 𝑀 ∧ 𝑀 ≤ (𝑀 Ramsey ∅))))
86	42, 82, 85	mpbir2and 709	1 ⊢ (𝑀 ∈ ℕ₀ → (𝑀 Ramsey ∅) = 𝑀)

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 394 ∨ wo 843 = wceq 1539 ∃wex 1779 ∈ wcel 2104 ≠ wne 2938 ∃wrex 3068 {crab 3430 Vcvv 3472 ⊆ wss 3949 ∅c0 4323 𝒫 cpw 4603 {csn 4629 class class class wbr 5149 ^◡ccnv 5676 “ cima 5680 ⟶wf 6540 ‘cfv 6544 (class class class)co 7413 ∈ cmpo 7415 ≈ cen 8940 ≼ cdom 8941 Fincfn 8943 0cc0 11114 1c1 11115 < clt 11254 ≤ cle 11255 − cmin 11450 ℕcn 12218 ℕ₀cn0 12478 ℤcz 12564 ...cfz 13490 Ccbc 14268 ♯chash 14296 Ramsey cram 16938

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2701 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7729 ax-cnex 11170 ax-resscn 11171 ax-1cn 11172 ax-icn 11173 ax-addcl 11174 ax-addrcl 11175 ax-mulcl 11176 ax-mulrcl 11177 ax-mulcom 11178 ax-addass 11179 ax-mulass 11180 ax-distr 11181 ax-i2m1 11182 ax-1ne0 11183 ax-1rid 11184 ax-rnegex 11185 ax-rrecex 11186 ax-cnre 11187 ax-pre-lttri 11188 ax-pre-lttrn 11189 ax-pre-ltadd 11190 ax-pre-mulgt0 11191

This theorem depends on definitions: df-bi 206 df-an 395 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2532 df-eu 2561 df-clab 2708 df-cleq 2722 df-clel 2808 df-nfc 2883 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3474 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-riota 7369 df-ov 7416 df-oprab 7417 df-mpo 7418 df-om 7860 df-1st 7979 df-2nd 7980 df-frecs 8270 df-wrecs 8301 df-recs 8375 df-rdg 8414 df-1o 8470 df-oadd 8474 df-er 8707 df-map 8826 df-en 8944 df-dom 8945 df-sdom 8946 df-fin 8947 df-sup 9441 df-inf 9442 df-dju 9900 df-card 9938 df-pnf 11256 df-mnf 11257 df-xr 11258 df-ltxr 11259 df-le 11260 df-sub 11452 df-neg 11453 df-div 11878 df-nn 12219 df-n0 12479 df-xnn0 12551 df-z 12565 df-uz 12829 df-rp 12981 df-fz 13491 df-seq 13973 df-fac 14240 df-bc 14269 df-hash 14297 df-ram 16940

This theorem is referenced by: 0ramcl 16962 ramcl 16968

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