Theorem ramub1 15570

Description: Inductive step for Ramsey's theorem, in the form of an explicit upper bound. (Contributed by Mario Carneiro, 23-Apr-2015.)

Hypotheses

Ref	Expression
ramub1.m	⊢ (𝜑 → 𝑀 ∈ ℕ)
ramub1.r	⊢ (𝜑 → 𝑅 ∈ Fin)
ramub1.f	⊢ (𝜑 → 𝐹:𝑅⟶ℕ)
ramub1.g	⊢ 𝐺 = (𝑥 ∈ 𝑅 ↦ (𝑀 Ramsey (𝑦 ∈ 𝑅 ↦ if(𝑦 = 𝑥, ((𝐹‘𝑥) − 1), (𝐹‘𝑦)))))
ramub1.1	⊢ (𝜑 → 𝐺:𝑅⟶ℕ0)
ramub1.2	⊢ (𝜑 → ((𝑀 − 1) Ramsey 𝐺) ∈ ℕ0)

Assertion

Ref	Expression
ramub1	⊢ (𝜑 → (𝑀 Ramsey 𝐹) ≤ (((𝑀 − 1) Ramsey 𝐺) + 1))

Distinct variable groups:   𝑥,𝑦,𝐹   𝑥,𝑀,𝑦   𝑥,𝐺,𝑦   𝑥,𝑅,𝑦   𝜑,𝑥,𝑦

Proof of Theorem ramub1

Dummy variables 𝑢 𝑐 𝑓 𝑠 𝑣 𝑤 𝑧 𝑎 𝑏 𝑖 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2610	. 2 ⊢ (𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖}) = (𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})
2		ramub1.m	. . 3 ⊢ (𝜑 → 𝑀 ∈ ℕ)
3	2	nnnn0d 11228	. 2 ⊢ (𝜑 → 𝑀 ∈ ℕ0)
4		ramub1.r	. 2 ⊢ (𝜑 → 𝑅 ∈ Fin)
5		ramub1.f	. . 3 ⊢ (𝜑 → 𝐹:𝑅⟶ℕ)
6		nnssnn0 11172	. . 3 ⊢ ℕ ⊆ ℕ0
7		fss 5969	. . 3 ⊢ ((𝐹:𝑅⟶ℕ ∧ ℕ ⊆ ℕ0) → 𝐹:𝑅⟶ℕ0)
8	5, 6, 7	sylancl 693	. 2 ⊢ (𝜑 → 𝐹:𝑅⟶ℕ0)
9		ramub1.2	. . 3 ⊢ (𝜑 → ((𝑀 − 1) Ramsey 𝐺) ∈ ℕ0)
10		peano2nn0 11210	. . 3 ⊢ (((𝑀 − 1) Ramsey 𝐺) ∈ ℕ0 → (((𝑀 − 1) Ramsey 𝐺) + 1) ∈ ℕ0)
11	9, 10	syl 17	. 2 ⊢ (𝜑 → (((𝑀 − 1) Ramsey 𝐺) + 1) ∈ ℕ0)
12		simprl 790	. . . . . 6 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → (#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1))
13	9	adantr 480	. . . . . . 7 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → ((𝑀 − 1) Ramsey 𝐺) ∈ ℕ0)
14		nn0p1nn 11209	. . . . . . 7 ⊢ (((𝑀 − 1) Ramsey 𝐺) ∈ ℕ0 → (((𝑀 − 1) Ramsey 𝐺) + 1) ∈ ℕ)
15	13, 14	syl 17	. . . . . 6 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → (((𝑀 − 1) Ramsey 𝐺) + 1) ∈ ℕ)
16	12, 15	eqeltrd 2688	. . . . 5 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → (#‘𝑠) ∈ ℕ)
17	16	nnnn0d 11228	. . . . . . 7 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → (#‘𝑠) ∈ ℕ0)
18		vex 3176	. . . . . . . 8 ⊢ 𝑠 ∈ V
19		hashclb 13011	. . . . . . . 8 ⊢ (𝑠 ∈ V → (𝑠 ∈ Fin ↔ (#‘𝑠) ∈ ℕ0))
20	18, 19	ax-mp 5	. . . . . . 7 ⊢ (𝑠 ∈ Fin ↔ (#‘𝑠) ∈ ℕ0)
21	17, 20	sylibr 223	. . . . . 6 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → 𝑠 ∈ Fin)
22		hashnncl 13018	. . . . . 6 ⊢ (𝑠 ∈ Fin → ((#‘𝑠) ∈ ℕ ↔ 𝑠 ≠ ∅))
23	21, 22	syl 17	. . . . 5 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → ((#‘𝑠) ∈ ℕ ↔ 𝑠 ≠ ∅))
24	16, 23	mpbid 221	. . . 4 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → 𝑠 ≠ ∅)
25		n0 3890	. . . 4 ⊢ (𝑠 ≠ ∅ ↔ ∃𝑤 𝑤 ∈ 𝑠)
26	24, 25	sylib 207	. . 3 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → ∃𝑤 𝑤 ∈ 𝑠)
27	2	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ (((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅) ∧ 𝑤 ∈ 𝑠)) → 𝑀 ∈ ℕ)
28	4	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ (((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅) ∧ 𝑤 ∈ 𝑠)) → 𝑅 ∈ Fin)
29	5	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ (((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅) ∧ 𝑤 ∈ 𝑠)) → 𝐹:𝑅⟶ℕ)
30		ramub1.g	. . . . . 6 ⊢ 𝐺 = (𝑥 ∈ 𝑅 ↦ (𝑀 Ramsey (𝑦 ∈ 𝑅 ↦ if(𝑦 = 𝑥, ((𝐹‘𝑥) − 1), (𝐹‘𝑦)))))
31		ramub1.1	. . . . . . 7 ⊢ (𝜑 → 𝐺:𝑅⟶ℕ0)
32	31	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ (((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅) ∧ 𝑤 ∈ 𝑠)) → 𝐺:𝑅⟶ℕ0)
33	9	adantr 480	. . . . . 6 ⊢ ((𝜑 ∧ (((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅) ∧ 𝑤 ∈ 𝑠)) → ((𝑀 − 1) Ramsey 𝐺) ∈ ℕ0)
34	21	adantrr 749	. . . . . 6 ⊢ ((𝜑 ∧ (((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅) ∧ 𝑤 ∈ 𝑠)) → 𝑠 ∈ Fin)
35		simprll 798	. . . . . 6 ⊢ ((𝜑 ∧ (((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅) ∧ 𝑤 ∈ 𝑠)) → (#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1))
36		simprlr 799	. . . . . 6 ⊢ ((𝜑 ∧ (((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅) ∧ 𝑤 ∈ 𝑠)) → 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)
37		simprr 792	. . . . . 6 ⊢ ((𝜑 ∧ (((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅) ∧ 𝑤 ∈ 𝑠)) → 𝑤 ∈ 𝑠)
38		uneq1 3722	. . . . . . . 8 ⊢ (𝑣 = 𝑢 → (𝑣 ∪ {𝑤}) = (𝑢 ∪ {𝑤}))
39	38	fveq2d 6107	. . . . . . 7 ⊢ (𝑣 = 𝑢 → (𝑓‘(𝑣 ∪ {𝑤})) = (𝑓‘(𝑢 ∪ {𝑤})))
40	39	cbvmptv 4678	. . . . . 6 ⊢ (𝑣 ∈ ((𝑠 ∖ {𝑤})(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})(𝑀 − 1)) ↦ (𝑓‘(𝑣 ∪ {𝑤}))) = (𝑢 ∈ ((𝑠 ∖ {𝑤})(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})(𝑀 − 1)) ↦ (𝑓‘(𝑢 ∪ {𝑤})))
41	27, 28, 29, 30, 32, 33, 1, 34, 35, 36, 37, 40	ramub1lem2 15569	. . . . 5 ⊢ ((𝜑 ∧ (((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅) ∧ 𝑤 ∈ 𝑠)) → ∃𝑐 ∈ 𝑅 ∃𝑧 ∈ 𝒫 𝑠((𝐹‘𝑐) ≤ (#‘𝑧) ∧ (𝑧(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀) ⊆ (◡𝑓 “ {𝑐})))
42	41	expr 641	. . . 4 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → (𝑤 ∈ 𝑠 → ∃𝑐 ∈ 𝑅 ∃𝑧 ∈ 𝒫 𝑠((𝐹‘𝑐) ≤ (#‘𝑧) ∧ (𝑧(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀) ⊆ (◡𝑓 “ {𝑐}))))
43	42	exlimdv 1848	. . 3 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → (∃𝑤 𝑤 ∈ 𝑠 → ∃𝑐 ∈ 𝑅 ∃𝑧 ∈ 𝒫 𝑠((𝐹‘𝑐) ≤ (#‘𝑧) ∧ (𝑧(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀) ⊆ (◡𝑓 “ {𝑐}))))
44	26, 43	mpd 15	. 2 ⊢ ((𝜑 ∧ ((#‘𝑠) = (((𝑀 − 1) Ramsey 𝐺) + 1) ∧ 𝑓:(𝑠(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀)⟶𝑅)) → ∃𝑐 ∈ 𝑅 ∃𝑧 ∈ 𝒫 𝑠((𝐹‘𝑐) ≤ (#‘𝑧) ∧ (𝑧(𝑎 ∈ V, 𝑖 ∈ ℕ0 ↦ {𝑏 ∈ 𝒫 𝑎 ∣ (#‘𝑏) = 𝑖})𝑀) ⊆ (◡𝑓 “ {𝑐})))
45	1, 3, 4, 8, 11, 44	ramub2 15556	1 ⊢ (𝜑 → (𝑀 Ramsey 𝐹) ≤ (((𝑀 − 1) Ramsey 𝐺) + 1))

Syntax hints:   → wi 4   ↔ wb 195   ∧ wa 383   = wceq 1475  ∃wex 1695   ∈ wcel 1977   ≠ wne 2780  ∃wrex 2897  {crab 2900  Vcvv 3173   ∖ cdif 3537   ∪ cun 3538   ⊆ wss 3540  ∅c0 3874  ifcif 4036  𝒫 cpw 4108  {csn 4125   class class class wbr 4583   ↦ cmpt 4643  ^◡ccnv 5037   “ cima 5041  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549   ↦ cmpt2 6551  Fincfn 7841  1c1 9816   + caddc 9818   ≤ cle 9954   − cmin 10145  ℕcn 10897  ℕ₀cn0 11169  #chash 12979   Ramsey cram 15541

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-oadd 7451  df-er 7629  df-map 7746  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-sup 8231  df-inf 8232  df-card 8648  df-cda 8873  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-n0 11170  df-xnn0 11241  df-z 11255  df-uz 11564  df-fz 12198  df-hash 12980  df-ram 15543

This theorem is referenced by:  ramcl  15571