Theorem txindislem 21246

Description: Lemma for txindis 21247. (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 5122	. . 3 ⊢ (∅ × ( I ‘𝐵)) = ∅
2		fvprc 6097	. . . 4 ⊢ (¬ 𝐴 ∈ V → ( I ‘𝐴) = ∅)
3	2	xpeq1d 5062	. . 3 ⊢ (¬ 𝐴 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = (∅ × ( I ‘𝐵)))
4		simpr 476	. . . . . . . 8 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → 𝐵 = ∅)
5	4	xpeq2d 5063	. . . . . . 7 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → (𝐴 × 𝐵) = (𝐴 × ∅))
6		xp0 5471	. . . . . . 7 ⊢ (𝐴 × ∅) = ∅
7	5, 6	syl6eq 2660	. . . . . 6 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → (𝐴 × 𝐵) = ∅)
8	7	fveq2d 6107	. . . . 5 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → ( I ‘(𝐴 × 𝐵)) = ( I ‘∅))
9		0ex 4718	. . . . . 6 ⊢ ∅ ∈ V
10		fvi 6165	. . . . . 6 ⊢ (∅ ∈ V → ( I ‘∅) = ∅)
11	9, 10	ax-mp 5	. . . . 5 ⊢ ( I ‘∅) = ∅
12	8, 11	syl6eq 2660	. . . 4 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
13		dmexg 6989	. . . . . . . 8 ⊢ ((𝐴 × 𝐵) ∈ V → dom (𝐴 × 𝐵) ∈ V)
14		dmxp 5265	. . . . . . . . 9 ⊢ (𝐵 ≠ ∅ → dom (𝐴 × 𝐵) = 𝐴)
15	14	eleq1d 2672	. . . . . . . 8 ⊢ (𝐵 ≠ ∅ → (dom (𝐴 × 𝐵) ∈ V ↔ 𝐴 ∈ V))
16	13, 15	syl5ib 233	. . . . . . 7 ⊢ (𝐵 ≠ ∅ → ((𝐴 × 𝐵) ∈ V → 𝐴 ∈ V))
17	16	con3d 147	. . . . . 6 ⊢ (𝐵 ≠ ∅ → (¬ 𝐴 ∈ V → ¬ (𝐴 × 𝐵) ∈ V))
18	17	impcom 445	. . . . 5 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 ≠ ∅) → ¬ (𝐴 × 𝐵) ∈ V)
19		fvprc 6097	. . . . 5 ⊢ (¬ (𝐴 × 𝐵) ∈ V → ( I ‘(𝐴 × 𝐵)) = ∅)
20	18, 19	syl 17	. . . 4 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 ≠ ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
21	12, 20	pm2.61dane 2869	. . 3 ⊢ (¬ 𝐴 ∈ V → ( I ‘(𝐴 × 𝐵)) = ∅)
22	1, 3, 21	3eqtr4a 2670	. 2 ⊢ (¬ 𝐴 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵)))
23		xp0 5471	. . 3 ⊢ (( I ‘𝐴) × ∅) = ∅
24		fvprc 6097	. . . 4 ⊢ (¬ 𝐵 ∈ V → ( I ‘𝐵) = ∅)
25	24	xpeq2d 5063	. . 3 ⊢ (¬ 𝐵 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = (( I ‘𝐴) × ∅))
26		simpr 476	. . . . . . . 8 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → 𝐴 = ∅)
27	26	xpeq1d 5062	. . . . . . 7 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → (𝐴 × 𝐵) = (∅ × 𝐵))
28		0xp 5122	. . . . . . 7 ⊢ (∅ × 𝐵) = ∅
29	27, 28	syl6eq 2660	. . . . . 6 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → (𝐴 × 𝐵) = ∅)
30	29	fveq2d 6107	. . . . 5 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → ( I ‘(𝐴 × 𝐵)) = ( I ‘∅))
31	30, 11	syl6eq 2660	. . . 4 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
32		rnexg 6990	. . . . . . . 8 ⊢ ((𝐴 × 𝐵) ∈ V → ran (𝐴 × 𝐵) ∈ V)
33		rnxp 5483	. . . . . . . . 9 ⊢ (𝐴 ≠ ∅ → ran (𝐴 × 𝐵) = 𝐵)
34	33	eleq1d 2672	. . . . . . . 8 ⊢ (𝐴 ≠ ∅ → (ran (𝐴 × 𝐵) ∈ V ↔ 𝐵 ∈ V))
35	32, 34	syl5ib 233	. . . . . . 7 ⊢ (𝐴 ≠ ∅ → ((𝐴 × 𝐵) ∈ V → 𝐵 ∈ V))
36	35	con3d 147	. . . . . 6 ⊢ (𝐴 ≠ ∅ → (¬ 𝐵 ∈ V → ¬ (𝐴 × 𝐵) ∈ V))
37	36	impcom 445	. . . . 5 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 ≠ ∅) → ¬ (𝐴 × 𝐵) ∈ V)
38	37, 19	syl 17	. . . 4 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 ≠ ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
39	31, 38	pm2.61dane 2869	. . 3 ⊢ (¬ 𝐵 ∈ V → ( I ‘(𝐴 × 𝐵)) = ∅)
40	23, 25, 39	3eqtr4a 2670	. 2 ⊢ (¬ 𝐵 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵)))
41		fvi 6165	. . . 4 ⊢ (𝐴 ∈ V → ( I ‘𝐴) = 𝐴)
42		fvi 6165	. . . 4 ⊢ (𝐵 ∈ V → ( I ‘𝐵) = 𝐵)
43		xpeq12 5058	. . . 4 ⊢ ((( I ‘𝐴) = 𝐴 ∧ ( I ‘𝐵) = 𝐵) → (( I ‘𝐴) × ( I ‘𝐵)) = (𝐴 × 𝐵))
44	41, 42, 43	syl2an 493	. . 3 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (( I ‘𝐴) × ( I ‘𝐵)) = (𝐴 × 𝐵))
45		xpexg 6858	. . . 4 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 × 𝐵) ∈ V)
46		fvi 6165	. . . 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 2647	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵)))
49	22, 40, 48	ecase 980	1 ⊢ (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵))

Syntax hints:  ¬ wn 3   ∧ wa 383   = wceq 1475   ∈ wcel 1977   ≠ wne 2780  Vcvv 3173  ∅c0 3874   I cid 4948   × cxp 5036  dom cdm 5038  ran crn 5039  ‘cfv 5804

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-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  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-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-br 4584  df-opab 4644  df-id 4953  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-iota 5768  df-fun 5806  df-fv 5812

This theorem is referenced by:  txindis  21247