Theorem rnxrn 38759

Description: Range of the range Cartesian product of classes. (Contributed by Peter Mazsa, 1-Jun-2020.)

Assertion

Ref	Expression
rnxrn	⊢ ran (𝑅 ⋉ 𝑆) = {⟨𝑥, 𝑦⟩ ∣ ∃𝑢(𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)}

Distinct variable groups:   𝑢,𝑅,𝑥,𝑦   𝑢,𝑆,𝑥,𝑦

Proof of Theorem rnxrn

Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		3anass 1095	. . . . 5 ⊢ ((𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦) ↔ (𝑤 = ⟨𝑥, 𝑦⟩ ∧ (𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)))
2	1	3exbii 1852	. . . 4 ⊢ (∃𝑢∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦) ↔ ∃𝑢∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ (𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)))
3		exrot3 2171	. . . 4 ⊢ (∃𝑢∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ (𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)) ↔ ∃𝑥∃𝑦∃𝑢(𝑤 = ⟨𝑥, 𝑦⟩ ∧ (𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)))
4		19.42v 1955	. . . . 5 ⊢ (∃𝑢(𝑤 = ⟨𝑥, 𝑦⟩ ∧ (𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)) ↔ (𝑤 = ⟨𝑥, 𝑦⟩ ∧ ∃𝑢(𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)))
5	4	2exbii 1851	. . . 4 ⊢ (∃𝑥∃𝑦∃𝑢(𝑤 = ⟨𝑥, 𝑦⟩ ∧ (𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)) ↔ ∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ ∃𝑢(𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)))
6	2, 3, 5	3bitri 297	. . 3 ⊢ (∃𝑢∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦) ↔ ∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ ∃𝑢(𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)))
7	6	abbii 2804	. 2 ⊢ {𝑤 ∣ ∃𝑢∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)} = {𝑤 ∣ ∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ ∃𝑢(𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦))}
8		dfrn6 38646	. . 3 ⊢ ran (𝑅 ⋉ 𝑆) = {𝑤 ∣ [𝑤]◡(𝑅 ⋉ 𝑆) ≠ ∅}
9		n0 4294	. . . . 5 ⊢ ([𝑤]◡(𝑅 ⋉ 𝑆) ≠ ∅ ↔ ∃𝑢 𝑢 ∈ [𝑤]◡(𝑅 ⋉ 𝑆))
10		elec1cnvxrn2 38758	. . . . . . 7 ⊢ (𝑢 ∈ V → (𝑢 ∈ [𝑤]◡(𝑅 ⋉ 𝑆) ↔ ∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)))
11	10	elv 3435	. . . . . 6 ⊢ (𝑢 ∈ [𝑤]◡(𝑅 ⋉ 𝑆) ↔ ∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦))
12	11	exbii 1850	. . . . 5 ⊢ (∃𝑢 𝑢 ∈ [𝑤]◡(𝑅 ⋉ 𝑆) ↔ ∃𝑢∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦))
13	9, 12	bitri 275	. . . 4 ⊢ ([𝑤]◡(𝑅 ⋉ 𝑆) ≠ ∅ ↔ ∃𝑢∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦))
14	13	abbii 2804	. . 3 ⊢ {𝑤 ∣ [𝑤]◡(𝑅 ⋉ 𝑆) ≠ ∅} = {𝑤 ∣ ∃𝑢∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)}
15	8, 14	eqtri 2760	. 2 ⊢ ran (𝑅 ⋉ 𝑆) = {𝑤 ∣ ∃𝑢∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)}
16		df-opab 5149	. 2 ⊢ {⟨𝑥, 𝑦⟩ ∣ ∃𝑢(𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)} = {𝑤 ∣ ∃𝑥∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ ∃𝑢(𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦))}
17	7, 15, 16	3eqtr4i 2770	1 ⊢ ran (𝑅 ⋉ 𝑆) = {⟨𝑥, 𝑦⟩ ∣ ∃𝑢(𝑢𝑅𝑥 ∧ 𝑢𝑆𝑦)}

Syntax hints:   ↔ wb 206   ∧ wa 395   ∧ w3a 1087   = wceq 1542  ∃wex 1781   ∈ wcel 2114  {cab 2715   ≠ wne 2933  Vcvv 3430  ∅c0 4274  ⟨cop 4574   class class class wbr 5086  {copab 5148  ^◡ccnv 5624  ran crn 5626  [cec 8635   ⋉ cxrn 38512

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5232  ax-nul 5242  ax-pr 5371  ax-un 7683

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3391  df-v 3432  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-sn 4569  df-pr 4571  df-op 4575  df-uni 4852  df-br 5087  df-opab 5149  df-mpt 5168  df-id 5520  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-rn 5636  df-res 5637  df-ima 5638  df-iota 6449  df-fun 6495  df-fn 6496  df-f 6497  df-fo 6499  df-fv 6501  df-1st 7936  df-2nd 7937  df-ec 8639  df-xrn 38718

This theorem is referenced by:  rnxrnres  38760  dfcoss4  38843  dfssr2  38917