Theorem fpr 7126

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 6572	. . 3 ⊢ (𝐴 ≠ 𝐵 → Fun {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩})
6	3, 4	dmprop 6190	. . 3 ⊢ dom {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} = {𝐴, 𝐵}
7		df-fn 6514	. . 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 4592	. . . . 5 ⊢ {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} = ({⟨𝐴, 𝐶⟩} ∪ {⟨𝐵, 𝐷⟩})
10	9	rneqi 5901	. . . 4 ⊢ ran {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} = ran ({⟨𝐴, 𝐶⟩} ∪ {⟨𝐵, 𝐷⟩})
11		rnun 6118	. . . 4 ⊢ ran ({⟨𝐴, 𝐶⟩} ∪ {⟨𝐵, 𝐷⟩}) = (ran {⟨𝐴, 𝐶⟩} ∪ ran {⟨𝐵, 𝐷⟩})
12	1	rnsnop 6197	. . . . . 6 ⊢ ran {⟨𝐴, 𝐶⟩} = {𝐶}
13	2	rnsnop 6197	. . . . . 6 ⊢ ran {⟨𝐵, 𝐷⟩} = {𝐷}
14	12, 13	uneq12i 4129	. . . . 5 ⊢ (ran {⟨𝐴, 𝐶⟩} ∪ ran {⟨𝐵, 𝐷⟩}) = ({𝐶} ∪ {𝐷})
15		df-pr 4592	. . . . 5 ⊢ {𝐶, 𝐷} = ({𝐶} ∪ {𝐷})
16	14, 15	eqtr4i 2755	. . . 4 ⊢ (ran {⟨𝐴, 𝐶⟩} ∪ ran {⟨𝐵, 𝐷⟩}) = {𝐶, 𝐷}
17	10, 11, 16	3eqtri 2756	. . 3 ⊢ ran {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} = {𝐶, 𝐷}
18	17	eqimssi 4007	. 2 ⊢ ran {⟨𝐴, 𝐶⟩, ⟨𝐵, 𝐷⟩} ⊆ {𝐶, 𝐷}
19		df-f 6515	. 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 1540   ∈ wcel 2109   ≠ wne 2925  Vcvv 3447   ∪ cun 3912   ⊆ wss 3914  {csn 4589  {cpr 4591  ⟨cop 4595  dom cdm 5638  ran crn 5639  Fun wfun 6505   Fn wfn 6506  ⟶wf 6507

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-12 2178  ax-ext 2701  ax-sep 5251  ax-nul 5261  ax-pr 5387

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-clab 2708  df-cleq 2721  df-clel 2803  df-ne 2926  df-ral 3045  df-rex 3054  df-rab 3406  df-v 3449  df-dif 3917  df-un 3919  df-in 3921  df-ss 3931  df-nul 4297  df-if 4489  df-sn 4590  df-pr 4592  df-op 4596  df-br 5108  df-opab 5170  df-id 5533  df-xp 5644  df-rel 5645  df-cnv 5646  df-co 5647  df-dm 5648  df-rn 5649  df-fun 6513  df-fn 6514  df-f 6515

This theorem is referenced by:  fprg  7127  fprb  7168  1sdomOLD  9196  axlowdimlem4  28872  coinfliprv  34474  poimirlem22  37636  nnsum3primes4  47789  nnsum3primesgbe  47793