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Theorem 2ndval2 4074
Description: Alternate value of the function that extracts the second member of an ordered pair. Definition 5.13 (ii) of [Monk1] p. 52.
Assertion
Ref Expression
2ndval2 |- (A e. (V X. V) -> (2nd` A) = |^||^||^|`'{A})

Proof of Theorem 2ndval2
StepHypRef Expression
1 elvv 3218 . 2 |- (A e. (V X. V) <-> E.xE.y A = <.x, y>.)
2 visset 1804 . . . . . 6 |- x e. V
3 visset 1804 . . . . . 6 |- y e. V
42, 3op2nd 4070 . . . . 5 |- (2nd` <.x, y>.) = y
52, 3op2ndb 3437 . . . . 5 |- |^||^||^|`'{<.x, y>.} = y
64, 5eqtr4 1490 . . . 4 |- (2nd` <.x, y>.) = |^||^||^|`'{<.x, y>.}
7 fveq2 3709 . . . 4 |- (A = <.x, y>. -> (2nd` A) = (2nd` <.x, y>.))
8 sneq 2407 . . . . . . . 8 |- (A = <.x, y>. -> {A} = {<.x, y>.})
9 cnveq 3281 . . . . . . . 8 |- ({A} = {<.x, y>.} -> `'{A} = `'{<.x, y>.})
108, 9syl 10 . . . . . . 7 |- (A = <.x, y>. -> `'{A} = `'{<.x, y>.})
1110inteqd 2528 . . . . . 6 |- (A = <.x, y>. -> |^|`'{A} = |^|`'{<.x, y>.})
1211inteqd 2528 . . . . 5 |- (A = <.x, y>. -> |^||^|`'{A} = |^||^|`'{<.x, y>.})
1312inteqd 2528 . . . 4 |- (A = <.x, y>. -> |^||^||^|`'{A} = |^||^||^|`'{<.x, y>.})
146, 7, 133eqtr4a 1524 . . 3 |- (A = <.x, y>. -> (2nd` A) = |^||^||^|`'{A})
151419.23aivv 1291 . 2 |- (E.xE.y A = <.x, y>. -> (2nd` A) = |^||^||^|`'{A})
161, 15sylbi 199 1 |- (A e. (V X. V) -> (2nd` A) = |^||^||^|`'{A})
Colors of variables: wff set class
Syntax hints:   -> wi 3   = wceq 953   e. wcel 955  E.wex 977  Vcvv 1802  {csn 2399  <.cop 2401  |^|cint 2523   X. cxp 3158  `'ccnv 3159  ` cfv 3172  2ndc2nd 4062
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 959  ax-gen 960  ax-8 961  ax-9 962  ax-10 963  ax-11 964  ax-12 965  ax-13 966  ax-14 967  ax-17 968  ax-4 970  ax-5o 972  ax-6o 975  ax-9o 1119  ax-10o 1136  ax-16 1206  ax-11o 1213  ax-ext 1452  ax-sep 2693  ax-nul 2700  ax-pow 2732  ax-pr 2769  ax-un 2857
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 978  df-sb 1168  df-eu 1375  df-mo 1376  df-clab 1457  df-cleq 1462  df-clel 1465  df-ne 1579  df-ral 1641  df-rex 1642  df-v 1803  df-dif 2039  df-un 2040  df-in 2041  df-ss 2043  df-nul 2271  df-pw 2392  df-sn 2402  df-pr 2403  df-op 2406  df-uni 2494  df-int 2524  df-br 2610  df-opab 2657  df-id 2824  df-xp 3174  df-rel 3175  df-cnv 3176  df-co 3177  df-dm 3178  df-rn 3179  df-res 3180  df-ima 3181  df-fun 3182  df-fv 3188  df-2nd 4064
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