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Theorem brfi1indALT 13848
Description: Alternate proof of brfi1ind 13847, which does not use brfi1uzind 13846. (Contributed by Alexander van der Vekens, 7-Jan-2018.) (New usage is discouraged.) (Proof modification is discouraged.)
Hypotheses
Ref Expression
brfi1ind.r Rel 𝐺
brfi1ind.f 𝐹 ∈ V
brfi1ind.1 ((𝑣 = 𝑉𝑒 = 𝐸) → (𝜓𝜑))
brfi1ind.2 ((𝑣 = 𝑤𝑒 = 𝑓) → (𝜓𝜃))
brfi1ind.3 ((𝑣𝐺𝑒𝑛𝑣) → (𝑣 ∖ {𝑛})𝐺𝐹)
brfi1ind.4 ((𝑤 = (𝑣 ∖ {𝑛}) ∧ 𝑓 = 𝐹) → (𝜃𝜒))
brfi1ind.base ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 0) → 𝜓)
brfi1ind.step ((((𝑦 + 1) ∈ ℕ0 ∧ (𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1) ∧ 𝑛𝑣)) ∧ 𝜒) → 𝜓)
Assertion
Ref Expression
brfi1indALT ((𝑉𝐺𝐸𝑉 ∈ Fin) → 𝜑)
Distinct variable groups:   𝑒,𝐸,𝑛,𝑣   𝑓,𝐹,𝑤   𝑒,𝐺,𝑓,𝑛,𝑣,𝑤,𝑦   𝑒,𝑉,𝑛,𝑣   𝜓,𝑓,𝑛,𝑤,𝑦   𝜃,𝑒,𝑛,𝑣   𝜒,𝑓,𝑤   𝜑,𝑒,𝑛,𝑣
Allowed substitution hints:   𝜑(𝑦,𝑤,𝑓)   𝜓(𝑣,𝑒)   𝜒(𝑦,𝑣,𝑒,𝑛)   𝜃(𝑦,𝑤,𝑓)   𝐸(𝑦,𝑤,𝑓)   𝐹(𝑦,𝑣,𝑒,𝑛)   𝑉(𝑦,𝑤,𝑓)

Proof of Theorem brfi1indALT
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 hashcl 13707 . . 3 (𝑉 ∈ Fin → (♯‘𝑉) ∈ ℕ0)
2 dfclel 2899 . . . 4 ((♯‘𝑉) ∈ ℕ0 ↔ ∃𝑛(𝑛 = (♯‘𝑉) ∧ 𝑛 ∈ ℕ0))
3 eqeq2 2838 . . . . . . . . . . . . . 14 (𝑥 = 0 → ((♯‘𝑣) = 𝑥 ↔ (♯‘𝑣) = 0))
43anbi2d 628 . . . . . . . . . . . . 13 (𝑥 = 0 → ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) ↔ (𝑣𝐺𝑒 ∧ (♯‘𝑣) = 0)))
54imbi1d 343 . . . . . . . . . . . 12 (𝑥 = 0 → (((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) → 𝜓) ↔ ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 0) → 𝜓)))
652albidv 1917 . . . . . . . . . . 11 (𝑥 = 0 → (∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) → 𝜓) ↔ ∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 0) → 𝜓)))
7 eqeq2 2838 . . . . . . . . . . . . . 14 (𝑥 = 𝑦 → ((♯‘𝑣) = 𝑥 ↔ (♯‘𝑣) = 𝑦))
87anbi2d 628 . . . . . . . . . . . . 13 (𝑥 = 𝑦 → ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) ↔ (𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑦)))
98imbi1d 343 . . . . . . . . . . . 12 (𝑥 = 𝑦 → (((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) → 𝜓) ↔ ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑦) → 𝜓)))
1092albidv 1917 . . . . . . . . . . 11 (𝑥 = 𝑦 → (∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) → 𝜓) ↔ ∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑦) → 𝜓)))
11 eqeq2 2838 . . . . . . . . . . . . . 14 (𝑥 = (𝑦 + 1) → ((♯‘𝑣) = 𝑥 ↔ (♯‘𝑣) = (𝑦 + 1)))
1211anbi2d 628 . . . . . . . . . . . . 13 (𝑥 = (𝑦 + 1) → ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) ↔ (𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1))))
1312imbi1d 343 . . . . . . . . . . . 12 (𝑥 = (𝑦 + 1) → (((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) → 𝜓) ↔ ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1)) → 𝜓)))
14132albidv 1917 . . . . . . . . . . 11 (𝑥 = (𝑦 + 1) → (∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) → 𝜓) ↔ ∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1)) → 𝜓)))
15 eqeq2 2838 . . . . . . . . . . . . . 14 (𝑥 = 𝑛 → ((♯‘𝑣) = 𝑥 ↔ (♯‘𝑣) = 𝑛))
1615anbi2d 628 . . . . . . . . . . . . 13 (𝑥 = 𝑛 → ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) ↔ (𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑛)))
1716imbi1d 343 . . . . . . . . . . . 12 (𝑥 = 𝑛 → (((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) → 𝜓) ↔ ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑛) → 𝜓)))
18172albidv 1917 . . . . . . . . . . 11 (𝑥 = 𝑛 → (∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑥) → 𝜓) ↔ ∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑛) → 𝜓)))
19 brfi1ind.base . . . . . . . . . . . 12 ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 0) → 𝜓)
2019gen2 1790 . . . . . . . . . . 11 𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 0) → 𝜓)
21 breq12 5068 . . . . . . . . . . . . . . 15 ((𝑣 = 𝑤𝑒 = 𝑓) → (𝑣𝐺𝑒𝑤𝐺𝑓))
22 fveq2 6667 . . . . . . . . . . . . . . . . 17 (𝑣 = 𝑤 → (♯‘𝑣) = (♯‘𝑤))
2322eqeq1d 2828 . . . . . . . . . . . . . . . 16 (𝑣 = 𝑤 → ((♯‘𝑣) = 𝑦 ↔ (♯‘𝑤) = 𝑦))
2423adantr 481 . . . . . . . . . . . . . . 15 ((𝑣 = 𝑤𝑒 = 𝑓) → ((♯‘𝑣) = 𝑦 ↔ (♯‘𝑤) = 𝑦))
2521, 24anbi12d 630 . . . . . . . . . . . . . 14 ((𝑣 = 𝑤𝑒 = 𝑓) → ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑦) ↔ (𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦)))
26 brfi1ind.2 . . . . . . . . . . . . . 14 ((𝑣 = 𝑤𝑒 = 𝑓) → (𝜓𝜃))
2725, 26imbi12d 346 . . . . . . . . . . . . 13 ((𝑣 = 𝑤𝑒 = 𝑓) → (((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑦) → 𝜓) ↔ ((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃)))
2827cbval2vv 2431 . . . . . . . . . . . 12 (∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑦) → 𝜓) ↔ ∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃))
29 nn0re 11895 . . . . . . . . . . . . . . . . . . . 20 (𝑦 ∈ ℕ0𝑦 ∈ ℝ)
30 1re 10630 . . . . . . . . . . . . . . . . . . . . 21 1 ∈ ℝ
3130a1i 11 . . . . . . . . . . . . . . . . . . . 20 (𝑦 ∈ ℕ0 → 1 ∈ ℝ)
32 nn0ge0 11911 . . . . . . . . . . . . . . . . . . . 20 (𝑦 ∈ ℕ0 → 0 ≤ 𝑦)
33 0lt1 11151 . . . . . . . . . . . . . . . . . . . . 21 0 < 1
3433a1i 11 . . . . . . . . . . . . . . . . . . . 20 (𝑦 ∈ ℕ0 → 0 < 1)
3529, 31, 32, 34addgegt0d 11202 . . . . . . . . . . . . . . . . . . 19 (𝑦 ∈ ℕ0 → 0 < (𝑦 + 1))
3635adantr 481 . . . . . . . . . . . . . . . . . 18 ((𝑦 ∈ ℕ0 ∧ (♯‘𝑣) = (𝑦 + 1)) → 0 < (𝑦 + 1))
37 simpr 485 . . . . . . . . . . . . . . . . . 18 ((𝑦 ∈ ℕ0 ∧ (♯‘𝑣) = (𝑦 + 1)) → (♯‘𝑣) = (𝑦 + 1))
3836, 37breqtrrd 5091 . . . . . . . . . . . . . . . . 17 ((𝑦 ∈ ℕ0 ∧ (♯‘𝑣) = (𝑦 + 1)) → 0 < (♯‘𝑣))
3938adantrl 712 . . . . . . . . . . . . . . . 16 ((𝑦 ∈ ℕ0 ∧ (𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1))) → 0 < (♯‘𝑣))
40 vex 3503 . . . . . . . . . . . . . . . . . . 19 𝑣 ∈ V
41 hashgt0elex 13752 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑣 ∈ V ∧ 0 < (♯‘𝑣)) → ∃𝑛 𝑛𝑣)
42 brfi1ind.3 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑣𝐺𝑒𝑛𝑣) → (𝑣 ∖ {𝑛})𝐺𝐹)
4340a1i 11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ((𝑦 ∈ ℕ0𝑛𝑣) → 𝑣 ∈ V)
44 simpr 485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ((𝑦 ∈ ℕ0𝑛𝑣) → 𝑛𝑣)
45 simpl 483 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ((𝑦 ∈ ℕ0𝑛𝑣) → 𝑦 ∈ ℕ0)
46 hashdifsnp1 13844 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ((𝑣 ∈ V ∧ 𝑛𝑣𝑦 ∈ ℕ0) → ((♯‘𝑣) = (𝑦 + 1) → (♯‘(𝑣 ∖ {𝑛})) = 𝑦))
4743, 44, 45, 46syl3anc 1365 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ((𝑦 ∈ ℕ0𝑛𝑣) → ((♯‘𝑣) = (𝑦 + 1) → (♯‘(𝑣 ∖ {𝑛})) = 𝑦))
4847imp 407 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 (((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1)) → (♯‘(𝑣 ∖ {𝑛})) = 𝑦)
49 peano2nn0 11926 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 (𝑦 ∈ ℕ0 → (𝑦 + 1) ∈ ℕ0)
5049ad2antrr 722 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 (((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1)) → (𝑦 + 1) ∈ ℕ0)
5150ad2antlr 723 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 ((((∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) ∧ (𝑣 ∖ {𝑛})𝐺𝐹) ∧ ((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1))) ∧ 𝑣𝐺𝑒) → (𝑦 + 1) ∈ ℕ0)
52 simpr 485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 ((((∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) ∧ (𝑣 ∖ {𝑛})𝐺𝐹) ∧ ((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1))) ∧ 𝑣𝐺𝑒) → 𝑣𝐺𝑒)
53 simplrr 774 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 ((((∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) ∧ (𝑣 ∖ {𝑛})𝐺𝐹) ∧ ((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1))) ∧ 𝑣𝐺𝑒) → (♯‘𝑣) = (𝑦 + 1))
54 simprlr 776 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 (((∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) ∧ (𝑣 ∖ {𝑛})𝐺𝐹) ∧ ((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1))) → 𝑛𝑣)
5554adantr 481 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 ((((∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) ∧ (𝑣 ∖ {𝑛})𝐺𝐹) ∧ ((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1))) ∧ 𝑣𝐺𝑒) → 𝑛𝑣)
5652, 53, 553jca 1122 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 ((((∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) ∧ (𝑣 ∖ {𝑛})𝐺𝐹) ∧ ((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1))) ∧ 𝑣𝐺𝑒) → (𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1) ∧ 𝑛𝑣))
5751, 56jca 512 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 ((((∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) ∧ (𝑣 ∖ {𝑛})𝐺𝐹) ∧ ((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1))) ∧ 𝑣𝐺𝑒) → ((𝑦 + 1) ∈ ℕ0 ∧ (𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1) ∧ 𝑛𝑣)))
58 difexg 5228 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 (𝑣 ∈ V → (𝑣 ∖ {𝑛}) ∈ V)
5940, 58ax-mp 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 (𝑣 ∖ {𝑛}) ∈ V
60 brfi1ind.f . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 𝐹 ∈ V
61 breq12 5068 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 ((𝑤 = (𝑣 ∖ {𝑛}) ∧ 𝑓 = 𝐹) → (𝑤𝐺𝑓 ↔ (𝑣 ∖ {𝑛})𝐺𝐹))
62 fveq2 6667 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 (𝑤 = (𝑣 ∖ {𝑛}) → (♯‘𝑤) = (♯‘(𝑣 ∖ {𝑛})))
6362eqeq1d 2828 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 (𝑤 = (𝑣 ∖ {𝑛}) → ((♯‘𝑤) = 𝑦 ↔ (♯‘(𝑣 ∖ {𝑛})) = 𝑦))
6463adantr 481 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 ((𝑤 = (𝑣 ∖ {𝑛}) ∧ 𝑓 = 𝐹) → ((♯‘𝑤) = 𝑦 ↔ (♯‘(𝑣 ∖ {𝑛})) = 𝑦))
6561, 64anbi12d 630 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 ((𝑤 = (𝑣 ∖ {𝑛}) ∧ 𝑓 = 𝐹) → ((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) ↔ ((𝑣 ∖ {𝑛})𝐺𝐹 ∧ (♯‘(𝑣 ∖ {𝑛})) = 𝑦)))
66 brfi1ind.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 ((𝑤 = (𝑣 ∖ {𝑛}) ∧ 𝑓 = 𝐹) → (𝜃𝜒))
6765, 66imbi12d 346 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 ((𝑤 = (𝑣 ∖ {𝑛}) ∧ 𝑓 = 𝐹) → (((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) ↔ (((𝑣 ∖ {𝑛})𝐺𝐹 ∧ (♯‘(𝑣 ∖ {𝑛})) = 𝑦) → 𝜒)))
6867spc2gv 3605 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 (((𝑣 ∖ {𝑛}) ∈ V ∧ 𝐹 ∈ V) → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → (((𝑣 ∖ {𝑛})𝐺𝐹 ∧ (♯‘(𝑣 ∖ {𝑛})) = 𝑦) → 𝜒)))
6959, 60, 68mp2an 688 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → (((𝑣 ∖ {𝑛})𝐺𝐹 ∧ (♯‘(𝑣 ∖ {𝑛})) = 𝑦) → 𝜒))
7069expdimp 453 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 ((∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) ∧ (𝑣 ∖ {𝑛})𝐺𝐹) → ((♯‘(𝑣 ∖ {𝑛})) = 𝑦𝜒))
7170ad2antrr 722 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 ((((∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) ∧ (𝑣 ∖ {𝑛})𝐺𝐹) ∧ ((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1))) ∧ 𝑣𝐺𝑒) → ((♯‘(𝑣 ∖ {𝑛})) = 𝑦𝜒))
72 brfi1ind.step . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 ((((𝑦 + 1) ∈ ℕ0 ∧ (𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1) ∧ 𝑛𝑣)) ∧ 𝜒) → 𝜓)
7357, 71, 72syl6an 680 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ((((∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) ∧ (𝑣 ∖ {𝑛})𝐺𝐹) ∧ ((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1))) ∧ 𝑣𝐺𝑒) → ((♯‘(𝑣 ∖ {𝑛})) = 𝑦𝜓))
7473exp41 435 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → ((𝑣 ∖ {𝑛})𝐺𝐹 → (((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1)) → (𝑣𝐺𝑒 → ((♯‘(𝑣 ∖ {𝑛})) = 𝑦𝜓)))))
7574com15 101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ((♯‘(𝑣 ∖ {𝑛})) = 𝑦 → ((𝑣 ∖ {𝑛})𝐺𝐹 → (((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1)) → (𝑣𝐺𝑒 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓)))))
7675com23 86 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ((♯‘(𝑣 ∖ {𝑛})) = 𝑦 → (((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1)) → ((𝑣 ∖ {𝑛})𝐺𝐹 → (𝑣𝐺𝑒 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓)))))
7748, 76mpcom 38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 (((𝑦 ∈ ℕ0𝑛𝑣) ∧ (♯‘𝑣) = (𝑦 + 1)) → ((𝑣 ∖ {𝑛})𝐺𝐹 → (𝑣𝐺𝑒 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓))))
7877ex 413 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ((𝑦 ∈ ℕ0𝑛𝑣) → ((♯‘𝑣) = (𝑦 + 1) → ((𝑣 ∖ {𝑛})𝐺𝐹 → (𝑣𝐺𝑒 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓)))))
7978com23 86 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ((𝑦 ∈ ℕ0𝑛𝑣) → ((𝑣 ∖ {𝑛})𝐺𝐹 → ((♯‘𝑣) = (𝑦 + 1) → (𝑣𝐺𝑒 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓)))))
8079ex 413 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝑦 ∈ ℕ0 → (𝑛𝑣 → ((𝑣 ∖ {𝑛})𝐺𝐹 → ((♯‘𝑣) = (𝑦 + 1) → (𝑣𝐺𝑒 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓))))))
8180com15 101 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝑣𝐺𝑒 → (𝑛𝑣 → ((𝑣 ∖ {𝑛})𝐺𝐹 → ((♯‘𝑣) = (𝑦 + 1) → (𝑦 ∈ ℕ0 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓))))))
8281imp 407 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑣𝐺𝑒𝑛𝑣) → ((𝑣 ∖ {𝑛})𝐺𝐹 → ((♯‘𝑣) = (𝑦 + 1) → (𝑦 ∈ ℕ0 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓)))))
8342, 82mpd 15 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝑣𝐺𝑒𝑛𝑣) → ((♯‘𝑣) = (𝑦 + 1) → (𝑦 ∈ ℕ0 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓))))
8483ex 413 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑣𝐺𝑒 → (𝑛𝑣 → ((♯‘𝑣) = (𝑦 + 1) → (𝑦 ∈ ℕ0 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓)))))
8584com4l 92 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑛𝑣 → ((♯‘𝑣) = (𝑦 + 1) → (𝑦 ∈ ℕ0 → (𝑣𝐺𝑒 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓)))))
8685exlimiv 1924 . . . . . . . . . . . . . . . . . . . . . 22 (∃𝑛 𝑛𝑣 → ((♯‘𝑣) = (𝑦 + 1) → (𝑦 ∈ ℕ0 → (𝑣𝐺𝑒 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓)))))
8741, 86syl 17 . . . . . . . . . . . . . . . . . . . . 21 ((𝑣 ∈ V ∧ 0 < (♯‘𝑣)) → ((♯‘𝑣) = (𝑦 + 1) → (𝑦 ∈ ℕ0 → (𝑣𝐺𝑒 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓)))))
8887ex 413 . . . . . . . . . . . . . . . . . . . 20 (𝑣 ∈ V → (0 < (♯‘𝑣) → ((♯‘𝑣) = (𝑦 + 1) → (𝑦 ∈ ℕ0 → (𝑣𝐺𝑒 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓))))))
8988com25 99 . . . . . . . . . . . . . . . . . . 19 (𝑣 ∈ V → (𝑣𝐺𝑒 → ((♯‘𝑣) = (𝑦 + 1) → (𝑦 ∈ ℕ0 → (0 < (♯‘𝑣) → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓))))))
9040, 89ax-mp 5 . . . . . . . . . . . . . . . . . 18 (𝑣𝐺𝑒 → ((♯‘𝑣) = (𝑦 + 1) → (𝑦 ∈ ℕ0 → (0 < (♯‘𝑣) → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓)))))
9190imp 407 . . . . . . . . . . . . . . . . 17 ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1)) → (𝑦 ∈ ℕ0 → (0 < (♯‘𝑣) → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓))))
9291impcom 408 . . . . . . . . . . . . . . . 16 ((𝑦 ∈ ℕ0 ∧ (𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1))) → (0 < (♯‘𝑣) → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓)))
9339, 92mpd 15 . . . . . . . . . . . . . . 15 ((𝑦 ∈ ℕ0 ∧ (𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1))) → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → 𝜓))
9493impancom 452 . . . . . . . . . . . . . 14 ((𝑦 ∈ ℕ0 ∧ ∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃)) → ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1)) → 𝜓))
9594alrimivv 1922 . . . . . . . . . . . . 13 ((𝑦 ∈ ℕ0 ∧ ∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃)) → ∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1)) → 𝜓))
9695ex 413 . . . . . . . . . . . 12 (𝑦 ∈ ℕ0 → (∀𝑤𝑓((𝑤𝐺𝑓 ∧ (♯‘𝑤) = 𝑦) → 𝜃) → ∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1)) → 𝜓)))
9728, 96syl5bi 243 . . . . . . . . . . 11 (𝑦 ∈ ℕ0 → (∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑦) → 𝜓) → ∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = (𝑦 + 1)) → 𝜓)))
986, 10, 14, 18, 20, 97nn0ind 12066 . . . . . . . . . 10 (𝑛 ∈ ℕ0 → ∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑛) → 𝜓))
99 brfi1ind.r . . . . . . . . . . . . . 14 Rel 𝐺
10099brrelex1i 5607 . . . . . . . . . . . . 13 (𝑉𝐺𝐸𝑉 ∈ V)
10199brrelex2i 5608 . . . . . . . . . . . . 13 (𝑉𝐺𝐸𝐸 ∈ V)
102100, 101jca 512 . . . . . . . . . . . 12 (𝑉𝐺𝐸 → (𝑉 ∈ V ∧ 𝐸 ∈ V))
103 breq12 5068 . . . . . . . . . . . . . . . . 17 ((𝑣 = 𝑉𝑒 = 𝐸) → (𝑣𝐺𝑒𝑉𝐺𝐸))
104 fveq2 6667 . . . . . . . . . . . . . . . . . . 19 (𝑣 = 𝑉 → (♯‘𝑣) = (♯‘𝑉))
105104eqeq1d 2828 . . . . . . . . . . . . . . . . . 18 (𝑣 = 𝑉 → ((♯‘𝑣) = 𝑛 ↔ (♯‘𝑉) = 𝑛))
106105adantr 481 . . . . . . . . . . . . . . . . 17 ((𝑣 = 𝑉𝑒 = 𝐸) → ((♯‘𝑣) = 𝑛 ↔ (♯‘𝑉) = 𝑛))
107103, 106anbi12d 630 . . . . . . . . . . . . . . . 16 ((𝑣 = 𝑉𝑒 = 𝐸) → ((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑛) ↔ (𝑉𝐺𝐸 ∧ (♯‘𝑉) = 𝑛)))
108 brfi1ind.1 . . . . . . . . . . . . . . . 16 ((𝑣 = 𝑉𝑒 = 𝐸) → (𝜓𝜑))
109107, 108imbi12d 346 . . . . . . . . . . . . . . 15 ((𝑣 = 𝑉𝑒 = 𝐸) → (((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑛) → 𝜓) ↔ ((𝑉𝐺𝐸 ∧ (♯‘𝑉) = 𝑛) → 𝜑)))
110109spc2gv 3605 . . . . . . . . . . . . . 14 ((𝑉 ∈ V ∧ 𝐸 ∈ V) → (∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑛) → 𝜓) → ((𝑉𝐺𝐸 ∧ (♯‘𝑉) = 𝑛) → 𝜑)))
111110com23 86 . . . . . . . . . . . . 13 ((𝑉 ∈ V ∧ 𝐸 ∈ V) → ((𝑉𝐺𝐸 ∧ (♯‘𝑉) = 𝑛) → (∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑛) → 𝜓) → 𝜑)))
112111expd 416 . . . . . . . . . . . 12 ((𝑉 ∈ V ∧ 𝐸 ∈ V) → (𝑉𝐺𝐸 → ((♯‘𝑉) = 𝑛 → (∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑛) → 𝜓) → 𝜑))))
113102, 112mpcom 38 . . . . . . . . . . 11 (𝑉𝐺𝐸 → ((♯‘𝑉) = 𝑛 → (∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑛) → 𝜓) → 𝜑)))
114113imp 407 . . . . . . . . . 10 ((𝑉𝐺𝐸 ∧ (♯‘𝑉) = 𝑛) → (∀𝑣𝑒((𝑣𝐺𝑒 ∧ (♯‘𝑣) = 𝑛) → 𝜓) → 𝜑))
11598, 114syl5 34 . . . . . . . . 9 ((𝑉𝐺𝐸 ∧ (♯‘𝑉) = 𝑛) → (𝑛 ∈ ℕ0𝜑))
116115expcom 414 . . . . . . . 8 ((♯‘𝑉) = 𝑛 → (𝑉𝐺𝐸 → (𝑛 ∈ ℕ0𝜑)))
117116com23 86 . . . . . . 7 ((♯‘𝑉) = 𝑛 → (𝑛 ∈ ℕ0 → (𝑉𝐺𝐸𝜑)))
118117eqcoms 2834 . . . . . 6 (𝑛 = (♯‘𝑉) → (𝑛 ∈ ℕ0 → (𝑉𝐺𝐸𝜑)))
119118imp 407 . . . . 5 ((𝑛 = (♯‘𝑉) ∧ 𝑛 ∈ ℕ0) → (𝑉𝐺𝐸𝜑))
120119exlimiv 1924 . . . 4 (∃𝑛(𝑛 = (♯‘𝑉) ∧ 𝑛 ∈ ℕ0) → (𝑉𝐺𝐸𝜑))
1212, 120sylbi 218 . . 3 ((♯‘𝑉) ∈ ℕ0 → (𝑉𝐺𝐸𝜑))
1221, 121syl 17 . 2 (𝑉 ∈ Fin → (𝑉𝐺𝐸𝜑))
123122impcom 408 1 ((𝑉𝐺𝐸𝑉 ∈ Fin) → 𝜑)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207  wa 396  w3a 1081  wal 1528   = wceq 1530  wex 1773  wcel 2107  Vcvv 3500  cdif 3937  {csn 4564   class class class wbr 5063  Rel wrel 5559  cfv 6352  (class class class)co 7148  Fincfn 8498  cr 10525  0cc0 10526  1c1 10527   + caddc 10529   < clt 10664  0cn0 11886  chash 13680
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1904  ax-6 1963  ax-7 2008  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2153  ax-12 2169  ax-13 2385  ax-ext 2798  ax-rep 5187  ax-sep 5200  ax-nul 5207  ax-pow 5263  ax-pr 5326  ax-un 7451  ax-cnex 10582  ax-resscn 10583  ax-1cn 10584  ax-icn 10585  ax-addcl 10586  ax-addrcl 10587  ax-mulcl 10588  ax-mulrcl 10589  ax-mulcom 10590  ax-addass 10591  ax-mulass 10592  ax-distr 10593  ax-i2m1 10594  ax-1ne0 10595  ax-1rid 10596  ax-rnegex 10597  ax-rrecex 10598  ax-cnre 10599  ax-pre-lttri 10600  ax-pre-lttrn 10601  ax-pre-ltadd 10602  ax-pre-mulgt0 10603
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 844  df-3or 1082  df-3an 1083  df-tru 1533  df-ex 1774  df-nf 1778  df-sb 2063  df-mo 2620  df-eu 2652  df-clab 2805  df-cleq 2819  df-clel 2898  df-nfc 2968  df-ne 3022  df-nel 3129  df-ral 3148  df-rex 3149  df-reu 3150  df-rmo 3151  df-rab 3152  df-v 3502  df-sbc 3777  df-csb 3888  df-dif 3943  df-un 3945  df-in 3947  df-ss 3956  df-pss 3958  df-nul 4296  df-if 4471  df-pw 4544  df-sn 4565  df-pr 4567  df-tp 4569  df-op 4571  df-uni 4838  df-int 4875  df-iun 4919  df-br 5064  df-opab 5126  df-mpt 5144  df-tr 5170  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 6146  df-ord 6192  df-on 6193  df-lim 6194  df-suc 6195  df-iota 6312  df-fun 6354  df-fn 6355  df-f 6356  df-f1 6357  df-fo 6358  df-f1o 6359  df-fv 6360  df-riota 7106  df-ov 7151  df-oprab 7152  df-mpo 7153  df-om 7569  df-1st 7680  df-2nd 7681  df-wrecs 7938  df-recs 7999  df-rdg 8037  df-1o 8093  df-oadd 8097  df-er 8279  df-en 8499  df-dom 8500  df-sdom 8501  df-fin 8502  df-dju 9319  df-card 9357  df-pnf 10666  df-mnf 10667  df-xr 10668  df-ltxr 10669  df-le 10670  df-sub 10861  df-neg 10862  df-nn 11628  df-n0 11887  df-xnn0 11957  df-z 11971  df-uz 12233  df-fz 12883  df-hash 13681
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator