Theorem txindislem 22243

Description: Lemma for txindis 22244. (Contributed by Mario Carneiro, 14-Aug-2015.)

Assertion

Ref	Expression
txindislem	⊢ (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵))

Proof of Theorem txindislem

Step	Hyp	Ref	Expression
1		0xp 5651	. . 3 ⊢ (∅ × ( I ‘𝐵)) = ∅
2		fvprc 6665	. . . 4 ⊢ (¬ 𝐴 ∈ V → ( I ‘𝐴) = ∅)
3	2	xpeq1d 5586	. . 3 ⊢ (¬ 𝐴 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = (∅ × ( I ‘𝐵)))
4		simpr 487	. . . . . . . 8 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → 𝐵 = ∅)
5	4	xpeq2d 5587	. . . . . . 7 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → (𝐴 × 𝐵) = (𝐴 × ∅))
6		xp0 6017	. . . . . . 7 ⊢ (𝐴 × ∅) = ∅
7	5, 6	syl6eq 2874	. . . . . 6 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → (𝐴 × 𝐵) = ∅)
8	7	fveq2d 6676	. . . . 5 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → ( I ‘(𝐴 × 𝐵)) = ( I ‘∅))
9		0ex 5213	. . . . . 6 ⊢ ∅ ∈ V
10		fvi 6742	. . . . . 6 ⊢ (∅ ∈ V → ( I ‘∅) = ∅)
11	9, 10	ax-mp 5	. . . . 5 ⊢ ( I ‘∅) = ∅
12	8, 11	syl6eq 2874	. . . 4 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
13		dmexg 7615	. . . . . . . 8 ⊢ ((𝐴 × 𝐵) ∈ V → dom (𝐴 × 𝐵) ∈ V)
14		dmxp 5801	. . . . . . . . 9 ⊢ (𝐵 ≠ ∅ → dom (𝐴 × 𝐵) = 𝐴)
15	14	eleq1d 2899	. . . . . . . 8 ⊢ (𝐵 ≠ ∅ → (dom (𝐴 × 𝐵) ∈ V ↔ 𝐴 ∈ V))
16	13, 15	syl5ib 246	. . . . . . 7 ⊢ (𝐵 ≠ ∅ → ((𝐴 × 𝐵) ∈ V → 𝐴 ∈ V))
17	16	con3d 155	. . . . . 6 ⊢ (𝐵 ≠ ∅ → (¬ 𝐴 ∈ V → ¬ (𝐴 × 𝐵) ∈ V))
18	17	impcom 410	. . . . 5 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 ≠ ∅) → ¬ (𝐴 × 𝐵) ∈ V)
19		fvprc 6665	. . . . 5 ⊢ (¬ (𝐴 × 𝐵) ∈ V → ( I ‘(𝐴 × 𝐵)) = ∅)
20	18, 19	syl 17	. . . 4 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 ≠ ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
21	12, 20	pm2.61dane 3106	. . 3 ⊢ (¬ 𝐴 ∈ V → ( I ‘(𝐴 × 𝐵)) = ∅)
22	1, 3, 21	3eqtr4a 2884	. 2 ⊢ (¬ 𝐴 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵)))
23		xp0 6017	. . 3 ⊢ (( I ‘𝐴) × ∅) = ∅
24		fvprc 6665	. . . 4 ⊢ (¬ 𝐵 ∈ V → ( I ‘𝐵) = ∅)
25	24	xpeq2d 5587	. . 3 ⊢ (¬ 𝐵 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = (( I ‘𝐴) × ∅))
26		simpr 487	. . . . . . . 8 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → 𝐴 = ∅)
27	26	xpeq1d 5586	. . . . . . 7 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → (𝐴 × 𝐵) = (∅ × 𝐵))
28		0xp 5651	. . . . . . 7 ⊢ (∅ × 𝐵) = ∅
29	27, 28	syl6eq 2874	. . . . . 6 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → (𝐴 × 𝐵) = ∅)
30	29	fveq2d 6676	. . . . 5 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → ( I ‘(𝐴 × 𝐵)) = ( I ‘∅))
31	30, 11	syl6eq 2874	. . . 4 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
32		rnexg 7616	. . . . . . . 8 ⊢ ((𝐴 × 𝐵) ∈ V → ran (𝐴 × 𝐵) ∈ V)
33		rnxp 6029	. . . . . . . . 9 ⊢ (𝐴 ≠ ∅ → ran (𝐴 × 𝐵) = 𝐵)
34	33	eleq1d 2899	. . . . . . . 8 ⊢ (𝐴 ≠ ∅ → (ran (𝐴 × 𝐵) ∈ V ↔ 𝐵 ∈ V))
35	32, 34	syl5ib 246	. . . . . . 7 ⊢ (𝐴 ≠ ∅ → ((𝐴 × 𝐵) ∈ V → 𝐵 ∈ V))
36	35	con3d 155	. . . . . 6 ⊢ (𝐴 ≠ ∅ → (¬ 𝐵 ∈ V → ¬ (𝐴 × 𝐵) ∈ V))
37	36	impcom 410	. . . . 5 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 ≠ ∅) → ¬ (𝐴 × 𝐵) ∈ V)
38	37, 19	syl 17	. . . 4 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 ≠ ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
39	31, 38	pm2.61dane 3106	. . 3 ⊢ (¬ 𝐵 ∈ V → ( I ‘(𝐴 × 𝐵)) = ∅)
40	23, 25, 39	3eqtr4a 2884	. 2 ⊢ (¬ 𝐵 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵)))
41		fvi 6742	. . . 4 ⊢ (𝐴 ∈ V → ( I ‘𝐴) = 𝐴)
42		fvi 6742	. . . 4 ⊢ (𝐵 ∈ V → ( I ‘𝐵) = 𝐵)
43		xpeq12 5582	. . . 4 ⊢ ((( I ‘𝐴) = 𝐴 ∧ ( I ‘𝐵) = 𝐵) → (( I ‘𝐴) × ( I ‘𝐵)) = (𝐴 × 𝐵))
44	41, 42, 43	syl2an 597	. . 3 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (( I ‘𝐴) × ( I ‘𝐵)) = (𝐴 × 𝐵))
45		xpexg 7475	. . . 4 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 × 𝐵) ∈ V)
46		fvi 6742	. . . 4 ⊢ ((𝐴 × 𝐵) ∈ V → ( I ‘(𝐴 × 𝐵)) = (𝐴 × 𝐵))
47	45, 46	syl 17	. . 3 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → ( I ‘(𝐴 × 𝐵)) = (𝐴 × 𝐵))
48	44, 47	eqtr4d 2861	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵)))
49	22, 40, 48	ecase 1028	1 ⊢ (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵))

Syntax hints:  ¬ wn 3   ∧ wa 398   = wceq 1537   ∈ wcel 2114   ≠ wne 3018  Vcvv 3496  ∅c0 4293   I cid 5461   × cxp 5555  dom cdm 5557  ran crn 5558  ‘cfv 6357

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332  ax-un 7463

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ne 3019  df-ral 3145  df-rex 3146  df-rab 3149  df-v 3498  df-sbc 3775  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-pw 4543  df-sn 4570  df-pr 4572  df-op 4576  df-uni 4841  df-br 5069  df-opab 5131  df-id 5462  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-iota 6316  df-fun 6359  df-fv 6365

This theorem is referenced by:  txindis  22244