Theorem txindislem 23773

Description: Lemma for txindis 23774. (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 5764	. . 3 ⊢ (∅ × ( I ‘𝐵)) = ∅
2		fvprc 6877	. . . 4 ⊢ (¬ 𝐴 ∈ V → ( I ‘𝐴) = ∅)
3	2	xpeq1d 5694	. . 3 ⊢ (¬ 𝐴 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = (∅ × ( I ‘𝐵)))
4		simpr 489	. . . . . . . 8 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → 𝐵 = ∅)
5	4	xpeq2d 5695	. . . . . . 7 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → (𝐴 × 𝐵) = (𝐴 × ∅))
6		xp0 5765	. . . . . . 7 ⊢ (𝐴 × ∅) = ∅
7	5, 6	eqtrdi 2821	. . . . . 6 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → (𝐴 × 𝐵) = ∅)
8	7	fveq2d 6889	. . . . 5 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → ( I ‘(𝐴 × 𝐵)) = ( I ‘∅))
9		0ex 5275	. . . . . 6 ⊢ ∅ ∈ V
10		fvi 6961	. . . . . 6 ⊢ (∅ ∈ V → ( I ‘∅) = ∅)
11	9, 10	ax-mp 5	. . . . 5 ⊢ ( I ‘∅) = ∅
12	8, 11	eqtrdi 2821	. . . 4 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 = ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
13		dmexg 7901	. . . . . . . 8 ⊢ ((𝐴 × 𝐵) ∈ V → dom (𝐴 × 𝐵) ∈ V)
14		dmxp 5923	. . . . . . . . 9 ⊢ (𝐵 ≠ ∅ → dom (𝐴 × 𝐵) = 𝐴)
15	14	eleq1d 2855	. . . . . . . 8 ⊢ (𝐵 ≠ ∅ → (dom (𝐴 × 𝐵) ∈ V ↔ 𝐴 ∈ V))
16	13, 15	imbitrid 247	. . . . . . 7 ⊢ (𝐵 ≠ ∅ → ((𝐴 × 𝐵) ∈ V → 𝐴 ∈ V))
17	16	con3d 153	. . . . . 6 ⊢ (𝐵 ≠ ∅ → (¬ 𝐴 ∈ V → ¬ (𝐴 × 𝐵) ∈ V))
18	17	impcom 412	. . . . 5 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 ≠ ∅) → ¬ (𝐴 × 𝐵) ∈ V)
19		fvprc 6877	. . . . 5 ⊢ (¬ (𝐴 × 𝐵) ∈ V → ( I ‘(𝐴 × 𝐵)) = ∅)
20	18, 19	syl 18	. . . 4 ⊢ ((¬ 𝐴 ∈ V ∧ 𝐵 ≠ ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
21	12, 20	pm2.61dane 3052	. . 3 ⊢ (¬ 𝐴 ∈ V → ( I ‘(𝐴 × 𝐵)) = ∅)
22	1, 3, 21	3eqtr4a 2831	. 2 ⊢ (¬ 𝐴 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵)))
23		xp0 5765	. . 3 ⊢ (( I ‘𝐴) × ∅) = ∅
24		fvprc 6877	. . . 4 ⊢ (¬ 𝐵 ∈ V → ( I ‘𝐵) = ∅)
25	24	xpeq2d 5695	. . 3 ⊢ (¬ 𝐵 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = (( I ‘𝐴) × ∅))
26		simpr 489	. . . . . . . 8 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → 𝐴 = ∅)
27	26	xpeq1d 5694	. . . . . . 7 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → (𝐴 × 𝐵) = (∅ × 𝐵))
28		0xp 5764	. . . . . . 7 ⊢ (∅ × 𝐵) = ∅
29	27, 28	eqtrdi 2821	. . . . . 6 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → (𝐴 × 𝐵) = ∅)
30	29	fveq2d 6889	. . . . 5 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → ( I ‘(𝐴 × 𝐵)) = ( I ‘∅))
31	30, 11	eqtrdi 2821	. . . 4 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 = ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
32		rnexg 7902	. . . . . . . 8 ⊢ ((𝐴 × 𝐵) ∈ V → ran (𝐴 × 𝐵) ∈ V)
33		rnxp 6172	. . . . . . . . 9 ⊢ (𝐴 ≠ ∅ → ran (𝐴 × 𝐵) = 𝐵)
34	33	eleq1d 2855	. . . . . . . 8 ⊢ (𝐴 ≠ ∅ → (ran (𝐴 × 𝐵) ∈ V ↔ 𝐵 ∈ V))
35	32, 34	imbitrid 247	. . . . . . 7 ⊢ (𝐴 ≠ ∅ → ((𝐴 × 𝐵) ∈ V → 𝐵 ∈ V))
36	35	con3d 153	. . . . . 6 ⊢ (𝐴 ≠ ∅ → (¬ 𝐵 ∈ V → ¬ (𝐴 × 𝐵) ∈ V))
37	36	impcom 412	. . . . 5 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 ≠ ∅) → ¬ (𝐴 × 𝐵) ∈ V)
38	37, 19	syl 18	. . . 4 ⊢ ((¬ 𝐵 ∈ V ∧ 𝐴 ≠ ∅) → ( I ‘(𝐴 × 𝐵)) = ∅)
39	31, 38	pm2.61dane 3052	. . 3 ⊢ (¬ 𝐵 ∈ V → ( I ‘(𝐴 × 𝐵)) = ∅)
40	23, 25, 39	3eqtr4a 2831	. 2 ⊢ (¬ 𝐵 ∈ V → (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵)))
41		fvi 6961	. . . 4 ⊢ (𝐴 ∈ V → ( I ‘𝐴) = 𝐴)
42		fvi 6961	. . . 4 ⊢ (𝐵 ∈ V → ( I ‘𝐵) = 𝐵)
43		xpeq12 5690	. . . 4 ⊢ ((( I ‘𝐴) = 𝐴 ∧ ( I ‘𝐵) = 𝐵) → (( I ‘𝐴) × ( I ‘𝐵)) = (𝐴 × 𝐵))
44	41, 42, 43	syl2an 607	. . 3 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (( I ‘𝐴) × ( I ‘𝐵)) = (𝐴 × 𝐵))
45		xpexg 7752	. . . 4 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 × 𝐵) ∈ V)
46		fvi 6961	. . . 4 ⊢ ((𝐴 × 𝐵) ∈ V → ( I ‘(𝐴 × 𝐵)) = (𝐴 × 𝐵))
47	45, 46	syl 18	. . 3 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → ( I ‘(𝐴 × 𝐵)) = (𝐴 × 𝐵))
48	44, 47	eqtr4d 2808	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵)))
49	22, 40, 48	ecase 1047	1 ⊢ (( I ‘𝐴) × ( I ‘𝐵)) = ( I ‘(𝐴 × 𝐵))

Syntax hints:  ¬ wn 3   ∧ wa 400   = wceq 1568   ∈ wcel 2150   ≠ wne 2965  Vcvv 3462  ∅c0 4294   I cid 5559   × cxp 5663  dom cdm 5665  ran crn 5666  ‘cfv 6540

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1823  ax-4 1837  ax-5 1938  ax-6 1995  ax-7 2036  ax-8 2152  ax-9 2160  ax-10 2183  ax-11 2199  ax-12 2220  ax-ext 2742  ax-sep 5262  ax-nul 5274  ax-pow 5340  ax-pr 5408  ax-un 7736

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1571  df-fal 1581  df-ex 1808  df-nf 1812  df-sb 2099  df-mo 2574  df-eu 2604  df-clab 2749  df-cleq 2762  df-clel 2845  df-ne 2966  df-ral 3087  df-rex 3097  df-rab 3424  df-v 3464  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4878  df-br 5115  df-opab 5179  df-id 5560  df-xp 5671  df-rel 5672  df-cnv 5673  df-co 5674  df-dm 5675  df-rn 5676  df-iota 6496  df-fun 6542  df-fv 6548

This theorem is referenced by:  txindis  23774