Theorem op2ndd 6345

Description: Extract the second member of an ordered pair. (Contributed by Mario Carneiro, 31-Aug-2015.)

Hypotheses

Ref	Expression
op1st.1	⊢ 𝐴 ∈ V
op1st.2	⊢ 𝐵 ∈ V

Assertion

Ref	Expression
op2ndd	⊢ (𝐶 = ⟨𝐴, 𝐵⟩ → (2nd ‘𝐶) = 𝐵)

Proof of Theorem op2ndd

Step	Hyp	Ref	Expression
1		fveq2 5672	. 2 ⊢ (𝐶 = ⟨𝐴, 𝐵⟩ → (2nd ‘𝐶) = (2nd ‘⟨𝐴, 𝐵⟩))
2		op1st.1	. . 3 ⊢ 𝐴 ∈ V
3		op1st.2	. . 3 ⊢ 𝐵 ∈ V
4	2, 3	op2nd 6343	. 2 ⊢ (2nd ‘⟨𝐴, 𝐵⟩) = 𝐵
5	1, 4	eqtrdi 2283	1 ⊢ (𝐶 = ⟨𝐴, 𝐵⟩ → (2nd ‘𝐶) = 𝐵)

Syntax hints:   → wi 4   = wceq 1398   ∈ wcel 2205  Vcvv 2815  ⟨cop 3694  ‘cfv 5354  2^nd c2nd 6335

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4230  ax-pow 4289  ax-pr 4324  ax-un 4556

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-sbc 3045  df-un 3217  df-in 3219  df-ss 3226  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-br 4112  df-opab 4174  df-mpt 4175  df-id 4416  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-iota 5314  df-fun 5356  df-fv 5362  df-2nd 6337

This theorem is referenced by:  xp2nd  6362  sbcopeq1a  6383  csbopeq1a  6384  eloprabi  6394  mpomptsx  6395  dmmpossx  6397  fmpox  6398  fmpoco  6414  df2nd2  6418  xporderlem  6429  xpf1o  7099  mapunen  7106  frecuzrdgtcl  10781  frecuzrdgfunlem  10788  fisumcom2  12132  fprodcom2fi  12320  txbas  15172  cnmpt2nd  15203  txhmeo  15233