Theorem op1std 6046

Description: Extract the first 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
op1std	⊢ (𝐶 = ⟨𝐴, 𝐵⟩ → (1st ‘𝐶) = 𝐴)

Proof of Theorem op1std

Step	Hyp	Ref	Expression
1		fveq2 5421	. 2 ⊢ (𝐶 = ⟨𝐴, 𝐵⟩ → (1st ‘𝐶) = (1st ‘⟨𝐴, 𝐵⟩))
2		op1st.1	. . 3 ⊢ 𝐴 ∈ V
3		op1st.2	. . 3 ⊢ 𝐵 ∈ V
4	2, 3	op1st 6044	. 2 ⊢ (1st ‘⟨𝐴, 𝐵⟩) = 𝐴
5	1, 4	syl6eq 2188	1 ⊢ (𝐶 = ⟨𝐴, 𝐵⟩ → (1st ‘𝐶) = 𝐴)

Syntax hints:   → wi 4   = wceq 1331   ∈ wcel 1480  Vcvv 2686  ⟨cop 3530  ‘cfv 5123  1^st c1st 6036

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-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-sep 4046  ax-pow 4098  ax-pr 4131  ax-un 4355

This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-eu 2002  df-mo 2003  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ral 2421  df-rex 2422  df-v 2688  df-sbc 2910  df-un 3075  df-in 3077  df-ss 3084  df-pw 3512  df-sn 3533  df-pr 3534  df-op 3536  df-uni 3737  df-br 3930  df-opab 3990  df-mpt 3991  df-id 4215  df-xp 4545  df-rel 4546  df-cnv 4547  df-co 4548  df-dm 4549  df-rn 4550  df-iota 5088  df-fun 5125  df-fv 5131  df-1st 6038

This theorem is referenced by:  xp1st  6063  sbcopeq1a  6085  csbopeq1a  6086  eloprabi  6094  mpomptsx  6095  dmmpossx  6097  fmpox  6098  fmpoco  6113  df1st2  6116  xporderlem  6128  xpf1o  6738  fisumcom2  11207  txbas  12427  cnmpt1st  12457  txhmeo  12488