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Theorem subrfn 45012
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 7425 . . 3 ((𝐴𝑥) − (𝐵𝑥)) ∈ V
2 eqid 2761 . . 3 (𝑥 ∈ ℝ ↦ ((𝐴𝑥) − (𝐵𝑥))) = (𝑥 ∈ ℝ ↦ ((𝐴𝑥) − (𝐵𝑥)))
31, 2fnmpti 6660 . 2 (𝑥 ∈ ℝ ↦ ((𝐴𝑥) − (𝐵𝑥))) Fn ℝ
4 subrval 45006 . . 3 ((𝐴𝐶𝐵𝐷) → (𝐴-𝑟𝐵) = (𝑥 ∈ ℝ ↦ ((𝐴𝑥) − (𝐵𝑥))))
54fneq1d 6610 . 2 ((𝐴𝐶𝐵𝐷) → ((𝐴-𝑟𝐵) Fn ℝ ↔ (𝑥 ∈ ℝ ↦ ((𝐴𝑥) − (𝐵𝑥))) Fn ℝ))
63, 5mpbiri 260 1 ((𝐴𝐶𝐵𝐷) → (𝐴-𝑟𝐵) Fn ℝ)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 399  wcel 2141  cmpt 5180   Fn wfn 6512  cfv 6517  (class class class)co 7392  cr 11069  cmin 11411  -𝑟cminusr 44997
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-rep 5226  ax-sep 5245  ax-nul 5255  ax-pr 5389  ax-cnex 11126  ax-resscn 11127
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-nf 1803  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3076  df-rex 3086  df-reu 3367  df-rab 3414  df-v 3455  df-sbc 3745  df-csb 3853  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4480  df-sn 4582  df-pr 4584  df-op 4588  df-uni 4865  df-iun 4950  df-br 5100  df-opab 5162  df-mpt 5181  df-id 5540  df-xp 5651  df-rel 5652  df-cnv 5653  df-co 5654  df-dm 5655  df-rn 5656  df-res 5657  df-ima 5658  df-iota 6473  df-fun 6519  df-fn 6520  df-f 6521  df-f1 6522  df-fo 6523  df-f1o 6524  df-fv 6525  df-ov 7395  df-oprab 7396  df-mpo 7397  df-subr 45003
This theorem is referenced by: (None)
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