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Theorem fvpr2g 7131
Description: The value of a function with a domain of (at most) two elements. (Contributed by Alexander van der Vekens, 3-Dec-2017.) (Proof shortened by BJ, 26-Sep-2024.)
Assertion
Ref Expression
fvpr2g ((𝐵𝑉𝐷𝑊𝐴𝐵) → ({⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩}‘𝐵) = 𝐷)

Proof of Theorem fvpr2g
StepHypRef Expression
1 prcom 4684 . . 3 {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} = {⟨𝐵, 𝐷⟩, ⟨𝐴, 𝐶⟩}
21fveq1i 6829 . 2 ({⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩}‘𝐵) = ({⟨𝐵, 𝐷⟩, ⟨𝐴, 𝐶⟩}‘𝐵)
3 necom 2982 . . 3 (𝐴𝐵𝐵𝐴)
4 fvpr1g 7130 . . 3 ((𝐵𝑉𝐷𝑊𝐵𝐴) → ({⟨𝐵, 𝐷⟩, ⟨𝐴, 𝐶⟩}‘𝐵) = 𝐷)
53, 4syl3an3b 1407 . 2 ((𝐵𝑉𝐷𝑊𝐴𝐵) → ({⟨𝐵, 𝐷⟩, ⟨𝐴, 𝐶⟩}‘𝐵) = 𝐷)
62, 5eqtrid 2780 1 ((𝐵𝑉𝐷𝑊𝐴𝐵) → ({⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩}‘𝐵) = 𝐷)
Colors of variables: wff setvar class
Syntax hints:  wi 4  w3a 1086   = wceq 1541  wcel 2113  wne 2929  {cpr 4577  cop 4581  cfv 6486
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2115  ax-9 2123  ax-10 2146  ax-12 2182  ax-ext 2705  ax-sep 5236  ax-nul 5246  ax-pr 5372
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2537  df-eu 2566  df-clab 2712  df-cleq 2725  df-clel 2808  df-ne 2930  df-ral 3049  df-rex 3058  df-rab 3397  df-v 3439  df-dif 3901  df-un 3903  df-in 3905  df-ss 3915  df-nul 4283  df-if 4475  df-sn 4576  df-pr 4578  df-op 4582  df-uni 4859  df-br 5094  df-opab 5156  df-id 5514  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-res 5631  df-iota 6442  df-fun 6488  df-fv 6494
This theorem is referenced by:  fvpr2  7133  fpropnf1  7207  f1prex  7224  wrdlen2i  14851  fvpr1o  17466  linds2eq  33353  zlmodzxzscm  48482  zlmodzxzadd  48483  lincvalpr  48544  ldepspr  48599  2arymptfv  48776  fv2prop  48826  prelrrx2b  48840  line2ylem  48877  line2  48878  line2x  48880  line2y  48881
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