Theorem genpdm 9824

Description: Domain of general operation on positive reals. (Contributed by NM, 18-Nov-1995.) (Revised by Mario Carneiro, 17-Nov-2014.) (New usage is discouraged.)

Hypotheses

Ref	Expression
genp.1	⊢ 𝐹 = (𝑤 ∈ P, 𝑣 ∈ P ↦ {𝑥 ∣ ∃𝑦 ∈ 𝑤 ∃𝑧 ∈ 𝑣 𝑥 = (𝑦𝐺𝑧)})
genp.2	⊢ ((𝑦 ∈ Q ∧ 𝑧 ∈ Q) → (𝑦𝐺𝑧) ∈ Q)

Assertion

Ref	Expression
genpdm	⊢ dom 𝐹 = (P × P)

Distinct variable group:   𝑥,𝑦,𝑧,𝑤,𝑣,𝐺

Allowed substitution hints:   𝐹(𝑥,𝑦,𝑧,𝑤,𝑣)

Proof of Theorem genpdm

Step	Hyp	Ref	Expression
1		elprnq 9813	. . . . . . . 8 ⊢ ((𝑤 ∈ P ∧ 𝑦 ∈ 𝑤) → 𝑦 ∈ Q)
2		elprnq 9813	. . . . . . . 8 ⊢ ((𝑣 ∈ P ∧ 𝑧 ∈ 𝑣) → 𝑧 ∈ Q)
3		genp.2	. . . . . . . . 9 ⊢ ((𝑦 ∈ Q ∧ 𝑧 ∈ Q) → (𝑦𝐺𝑧) ∈ Q)
4		eleq1 2689	. . . . . . . . 9 ⊢ (𝑥 = (𝑦𝐺𝑧) → (𝑥 ∈ Q ↔ (𝑦𝐺𝑧) ∈ Q))
5	3, 4	syl5ibrcom 237	. . . . . . . 8 ⊢ ((𝑦 ∈ Q ∧ 𝑧 ∈ Q) → (𝑥 = (𝑦𝐺𝑧) → 𝑥 ∈ Q))
6	1, 2, 5	syl2an 494	. . . . . . 7 ⊢ (((𝑤 ∈ P ∧ 𝑦 ∈ 𝑤) ∧ (𝑣 ∈ P ∧ 𝑧 ∈ 𝑣)) → (𝑥 = (𝑦𝐺𝑧) → 𝑥 ∈ Q))
7	6	an4s 869	. . . . . 6 ⊢ (((𝑤 ∈ P ∧ 𝑣 ∈ P) ∧ (𝑦 ∈ 𝑤 ∧ 𝑧 ∈ 𝑣)) → (𝑥 = (𝑦𝐺𝑧) → 𝑥 ∈ Q))
8	7	rexlimdvva 3038	. . . . 5 ⊢ ((𝑤 ∈ P ∧ 𝑣 ∈ P) → (∃𝑦 ∈ 𝑤 ∃𝑧 ∈ 𝑣 𝑥 = (𝑦𝐺𝑧) → 𝑥 ∈ Q))
9	8	abssdv 3676	. . . 4 ⊢ ((𝑤 ∈ P ∧ 𝑣 ∈ P) → {𝑥 ∣ ∃𝑦 ∈ 𝑤 ∃𝑧 ∈ 𝑣 𝑥 = (𝑦𝐺𝑧)} ⊆ Q)
10		nqex 9745	. . . 4 ⊢ Q ∈ V
11		ssexg 4804	. . . 4 ⊢ (({𝑥 ∣ ∃𝑦 ∈ 𝑤 ∃𝑧 ∈ 𝑣 𝑥 = (𝑦𝐺𝑧)} ⊆ Q ∧ Q ∈ V) → {𝑥 ∣ ∃𝑦 ∈ 𝑤 ∃𝑧 ∈ 𝑣 𝑥 = (𝑦𝐺𝑧)} ∈ V)
12	9, 10, 11	sylancl 694	. . 3 ⊢ ((𝑤 ∈ P ∧ 𝑣 ∈ P) → {𝑥 ∣ ∃𝑦 ∈ 𝑤 ∃𝑧 ∈ 𝑣 𝑥 = (𝑦𝐺𝑧)} ∈ V)
13	12	rgen2a 2977	. 2 ⊢ ∀𝑤 ∈ P ∀𝑣 ∈ P {𝑥 ∣ ∃𝑦 ∈ 𝑤 ∃𝑧 ∈ 𝑣 𝑥 = (𝑦𝐺𝑧)} ∈ V
14		genp.1	. . 3 ⊢ 𝐹 = (𝑤 ∈ P, 𝑣 ∈ P ↦ {𝑥 ∣ ∃𝑦 ∈ 𝑤 ∃𝑧 ∈ 𝑣 𝑥 = (𝑦𝐺𝑧)})
15	14	fnmpt2 7238	. 2 ⊢ (∀𝑤 ∈ P ∀𝑣 ∈ P {𝑥 ∣ ∃𝑦 ∈ 𝑤 ∃𝑧 ∈ 𝑣 𝑥 = (𝑦𝐺𝑧)} ∈ V → 𝐹 Fn (P × P))
16		fndm 5990	. 2 ⊢ (𝐹 Fn (P × P) → dom 𝐹 = (P × P))
17	13, 15, 16	mp2b 10	1 ⊢ dom 𝐹 = (P × P)

Syntax hints:   → wi 4   ∧ wa 384   = wceq 1483   ∈ wcel 1990  {cab 2608  ∀wral 2912  ∃wrex 2913  Vcvv 3200   ⊆ wss 3574   × cxp 5112  dom cdm 5114   Fn wfn 5883  (class class class)co 6650   ↦ cmpt2 6652  Qcnq 9674  Pcnp 9681

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-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-inf2 8538

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-ral 2917  df-rex 2918  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-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-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-fv 5896  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-ni 9694  df-nq 9734  df-np 9803

This theorem is referenced by:  dmplp  9834  dmmp  9835