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Theorem mpoeq12 5797
 Description: An equality theorem for the maps-to notation. (Contributed by Mario Carneiro, 16-Dec-2013.)
Assertion
Ref Expression
mpoeq12 ((𝐴 = 𝐶𝐵 = 𝐷) → (𝑥𝐴, 𝑦𝐵𝐸) = (𝑥𝐶, 𝑦𝐷𝐸))
Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐵,𝑦   𝑥,𝐶,𝑦   𝑥,𝐷,𝑦
Allowed substitution hints:   𝐸(𝑥,𝑦)

Proof of Theorem mpoeq12
StepHypRef Expression
1 eqid 2115 . . . . 5 𝐸 = 𝐸
21rgenw 2462 . . . 4 𝑦𝐵 𝐸 = 𝐸
32jctr 311 . . 3 (𝐵 = 𝐷 → (𝐵 = 𝐷 ∧ ∀𝑦𝐵 𝐸 = 𝐸))
43ralrimivw 2481 . 2 (𝐵 = 𝐷 → ∀𝑥𝐴 (𝐵 = 𝐷 ∧ ∀𝑦𝐵 𝐸 = 𝐸))
5 mpoeq123 5796 . 2 ((𝐴 = 𝐶 ∧ ∀𝑥𝐴 (𝐵 = 𝐷 ∧ ∀𝑦𝐵 𝐸 = 𝐸)) → (𝑥𝐴, 𝑦𝐵𝐸) = (𝑥𝐶, 𝑦𝐷𝐸))
64, 5sylan2 282 1 ((𝐴 = 𝐶𝐵 = 𝐷) → (𝑥𝐴, 𝑦𝐵𝐸) = (𝑥𝐶, 𝑦𝐷𝐸))
 Colors of variables: wff set class Syntax hints:   → wi 4   ∧ wa 103   = wceq 1314  ∀wral 2391   ∈ cmpo 5742 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-11 1467  ax-4 1470  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097 This theorem depends on definitions:  df-bi 116  df-tru 1317  df-nf 1420  df-sb 1719  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2245  df-ral 2396  df-oprab 5744  df-mpo 5745 This theorem is referenced by:  seqeq1  10161  txvalex  12318  txval  12319
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