Theorem fpr 7097

Description: A function with a domain of two elements. (Contributed by Jeff Madsen, 20-Jun-2010.) (Proof shortened by Andrew Salmon, 22-Oct-2011.)

Hypotheses

Ref	Expression
fpr.1	⊢ 𝐴 ∈ V
fpr.2	⊢ 𝐵 ∈ V
fpr.3	⊢ 𝐶 ∈ V
fpr.4	⊢ 𝐷 ∈ V

Assertion

Ref	Expression
fpr	⊢ (𝐴 ≠ 𝐵 → {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩}:{𝐴, 𝐵}⟶{𝐶, 𝐷})

Proof of Theorem fpr

Step	Hyp	Ref	Expression
1		fpr.1	. . . 4 ⊢ 𝐴 ∈ V
2		fpr.2	. . . 4 ⊢ 𝐵 ∈ V
3		fpr.3	. . . 4 ⊢ 𝐶 ∈ V
4		fpr.4	. . . 4 ⊢ 𝐷 ∈ V
5	1, 2, 3, 4	funpr 6546	. . 3 ⊢ (𝐴 ≠ 𝐵 → Fun {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩})
6	3, 4	dmprop 6173	. . 3 ⊢ dom {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} = {𝐴, 𝐵}
7		df-fn 6493	. . 3 ⊢ ({⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} Fn {𝐴, 𝐵} ↔ (Fun {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} ∧ dom {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} = {𝐴, 𝐵}))
8	5, 6, 7	sylanblrc 590	. 2 ⊢ (𝐴 ≠ 𝐵 → {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} Fn {𝐴, 𝐵})
9		df-pr 4581	. . . . 5 ⊢ {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} = ({⟨𝐴, 𝐶⟩} ∪ {⟨𝐵, 𝐷⟩})
10	9	rneqi 5884	. . . 4 ⊢ ran {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} = ran ({⟨𝐴, 𝐶⟩} ∪ {⟨𝐵, 𝐷⟩})
11		rnun 6101	. . . 4 ⊢ ran ({⟨𝐴, 𝐶⟩} ∪ {⟨𝐵, 𝐷⟩}) = (ran {⟨𝐴, 𝐶⟩} ∪ ran {⟨𝐵, 𝐷⟩})
12	1	rnsnop 6180	. . . . . 6 ⊢ ran {⟨𝐴, 𝐶⟩} = {𝐶}
13	2	rnsnop 6180	. . . . . 6 ⊢ ran {⟨𝐵, 𝐷⟩} = {𝐷}
14	12, 13	uneq12i 4116	. . . . 5 ⊢ (ran {⟨𝐴, 𝐶⟩} ∪ ran {⟨𝐵, 𝐷⟩}) = ({𝐶} ∪ {𝐷})
15		df-pr 4581	. . . . 5 ⊢ {𝐶, 𝐷} = ({𝐶} ∪ {𝐷})
16	14, 15	eqtr4i 2760	. . . 4 ⊢ (ran {⟨𝐴, 𝐶⟩} ∪ ran {⟨𝐵, 𝐷⟩}) = {𝐶, 𝐷}
17	10, 11, 16	3eqtri 2761	. . 3 ⊢ ran {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} = {𝐶, 𝐷}
18	17	eqimssi 3992	. 2 ⊢ ran {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} ⊆ {𝐶, 𝐷}
19		df-f 6494	. 2 ⊢ ({⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩}:{𝐴, 𝐵}⟶{𝐶, 𝐷} ↔ ({⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} Fn {𝐴, 𝐵} ∧ ran {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} ⊆ {𝐶, 𝐷}))
20	8, 18, 19	sylanblrc 590	1 ⊢ (𝐴 ≠ 𝐵 → {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩}:{𝐴, 𝐵}⟶{𝐶, 𝐷})

Syntax hints:   → wi 4   = wceq 1541   ∈ wcel 2113   ≠ wne 2930  Vcvv 3438   ∪ cun 3897   ⊆ wss 3899  {csn 4578  {cpr 4580  ⟨cop 4584  dom cdm 5622  ran crn 5623  Fun wfun 6484   Fn wfn 6485  ⟶wf 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-12 2182  ax-ext 2706  ax-sep 5239  ax-nul 5249  ax-pr 5375

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-sb 2068  df-mo 2537  df-clab 2713  df-cleq 2726  df-clel 2809  df-ne 2931  df-ral 3050  df-rex 3059  df-rab 3398  df-v 3440  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4284  df-if 4478  df-sn 4579  df-pr 4581  df-op 4585  df-br 5097  df-opab 5159  df-id 5517  df-xp 5628  df-rel 5629  df-cnv 5630  df-co 5631  df-dm 5632  df-rn 5633  df-fun 6492  df-fn 6493  df-f 6494

This theorem is referenced by:  fprg  7098  fprb  7138  axlowdimlem4  28967  coinfliprv  34589  poimirlem22  37782  nnsum3primes4  47976  nnsum3primesgbe  47980