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Theorem subrfn 44446
Description: Vector subtraction produces a function. (Contributed by Andrew Salmon, 27-Jan-2012.)
Assertion
Ref Expression
subrfn ((𝐴𝐶𝐵𝐷) → (𝐴-𝑟𝐵) Fn ℝ)

Proof of Theorem subrfn
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 ovex 7386 . . 3 ((𝐴𝑥) − (𝐵𝑥)) ∈ V
2 eqid 2729 . . 3 (𝑥 ∈ ℝ ↦ ((𝐴𝑥) − (𝐵𝑥))) = (𝑥 ∈ ℝ ↦ ((𝐴𝑥) − (𝐵𝑥)))
31, 2fnmpti 6629 . 2 (𝑥 ∈ ℝ ↦ ((𝐴𝑥) − (𝐵𝑥))) Fn ℝ
4 subrval 44440 . . 3 ((𝐴𝐶𝐵𝐷) → (𝐴-𝑟𝐵) = (𝑥 ∈ ℝ ↦ ((𝐴𝑥) − (𝐵𝑥))))
54fneq1d 6579 . 2 ((𝐴𝐶𝐵𝐷) → ((𝐴-𝑟𝐵) Fn ℝ ↔ (𝑥 ∈ ℝ ↦ ((𝐴𝑥) − (𝐵𝑥))) Fn ℝ))
63, 5mpbiri 258 1 ((𝐴𝐶𝐵𝐷) → (𝐴-𝑟𝐵) Fn ℝ)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395  wcel 2109  cmpt 5176   Fn wfn 6481  cfv 6486  (class class class)co 7353  cr 11027  cmin 11365  -𝑟cminusr 44431
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-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5221  ax-sep 5238  ax-nul 5248  ax-pr 5374  ax-cnex 11084  ax-resscn 11085
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-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-ral 3045  df-rex 3054  df-reu 3346  df-rab 3397  df-v 3440  df-sbc 3745  df-csb 3854  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4479  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4862  df-iun 4946  df-br 5096  df-opab 5158  df-mpt 5177  df-id 5518  df-xp 5629  df-rel 5630  df-cnv 5631  df-co 5632  df-dm 5633  df-rn 5634  df-res 5635  df-ima 5636  df-iota 6442  df-fun 6488  df-fn 6489  df-f 6490  df-f1 6491  df-fo 6492  df-f1o 6493  df-fv 6494  df-ov 7356  df-oprab 7357  df-mpo 7358  df-subr 44437
This theorem is referenced by: (None)
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