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Theorem fvsng 5446
 Description: The value of a singleton of an ordered pair is the second member. (Contributed by set.mm contributors, 26-Oct-2012.)
Assertion
Ref Expression
fvsng ((A V B W) → ({A, B} ‘A) = B)

Proof of Theorem fvsng
Dummy variables a b are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 opeq1 4578 . . . . 5 (a = Aa, b = A, b)
21sneqd 3746 . . . 4 (a = A → {a, b} = {A, b})
3 id 19 . . . 4 (a = Aa = A)
42, 3fveq12d 5333 . . 3 (a = A → ({a, b} ‘a) = ({A, b} ‘A))
54eqeq1d 2361 . 2 (a = A → (({a, b} ‘a) = b ↔ ({A, b} ‘A) = b))
6 opeq2 4579 . . . . 5 (b = BA, b = A, B)
76sneqd 3746 . . . 4 (b = B → {A, b} = {A, B})
87fveq1d 5330 . . 3 (b = B → ({A, b} ‘A) = ({A, B} ‘A))
9 id 19 . . 3 (b = Bb = B)
108, 9eqeq12d 2367 . 2 (b = B → (({A, b} ‘A) = b ↔ ({A, B} ‘A) = B))
11 vex 2862 . . 3 a V
12 vex 2862 . . 3 b V
1311, 12fvsn 5445 . 2 ({a, b} ‘a) = b
145, 10, 13vtocl2g 2918 1 ((A V B W) → ({A, B} ‘A) = B)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 358   = wceq 1642   ∈ wcel 1710  {csn 3737  ⟨cop 4561   ‘cfv 4781 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-13 1712  ax-14 1714  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4078  ax-xp 4079  ax-cnv 4080  ax-1c 4081  ax-sset 4082  ax-si 4083  ax-ins2 4084  ax-ins3 4085  ax-typlower 4086  ax-sn 4087 This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2208  df-mo 2209  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-ne 2518  df-ral 2619  df-rex 2620  df-reu 2621  df-rmo 2622  df-rab 2623  df-v 2861  df-sbc 3047  df-nin 3211  df-compl 3212  df-in 3213  df-un 3214  df-dif 3215  df-symdif 3216  df-ss 3259  df-pss 3261  df-nul 3551  df-if 3663  df-pw 3724  df-sn 3741  df-pr 3742  df-uni 3892  df-int 3927  df-opk 4058  df-1c 4136  df-pw1 4137  df-uni1 4138  df-xpk 4185  df-cnvk 4186  df-ins2k 4187  df-ins3k 4188  df-imak 4189  df-cok 4190  df-p6 4191  df-sik 4192  df-ssetk 4193  df-imagek 4194  df-idk 4195  df-iota 4339  df-0c 4377  df-addc 4378  df-nnc 4379  df-fin 4380  df-lefin 4440  df-ltfin 4441  df-ncfin 4442  df-tfin 4443  df-evenfin 4444  df-oddfin 4445  df-sfin 4446  df-spfin 4447  df-phi 4565  df-op 4566  df-proj1 4567  df-proj2 4568  df-opab 4623  df-br 4640  df-co 4726  df-ima 4727  df-id 4767  df-cnv 4785  df-rn 4786  df-dm 4787  df-fun 4789  df-fv 4795 This theorem is referenced by: (None)
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