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Theorem resubf 39287
Description: Real subtraction is an operation on the real numbers. Based on subf 10881. (Contributed by Steven Nguyen, 7-Jan-2023.)
Assertion
Ref Expression
resubf :(ℝ × ℝ)⟶ℝ

Proof of Theorem resubf
Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 resubval 39273 . . . 4 ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → (𝑥 𝑦) = (𝑧 ∈ ℝ (𝑦 + 𝑧) = 𝑥))
2 rersubcl 39284 . . . 4 ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → (𝑥 𝑦) ∈ ℝ)
31, 2eqeltrrd 2913 . . 3 ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ) → (𝑧 ∈ ℝ (𝑦 + 𝑧) = 𝑥) ∈ ℝ)
43rgen2 3202 . 2 𝑥 ∈ ℝ ∀𝑦 ∈ ℝ (𝑧 ∈ ℝ (𝑦 + 𝑧) = 𝑥) ∈ ℝ
5 df-resub 39272 . . 3 = (𝑥 ∈ ℝ, 𝑦 ∈ ℝ ↦ (𝑧 ∈ ℝ (𝑦 + 𝑧) = 𝑥))
65fmpo 7759 . 2 (∀𝑥 ∈ ℝ ∀𝑦 ∈ ℝ (𝑧 ∈ ℝ (𝑦 + 𝑧) = 𝑥) ∈ ℝ ↔ − :(ℝ × ℝ)⟶ℝ)
74, 6mpbi 232 1 :(ℝ × ℝ)⟶ℝ
Colors of variables: wff setvar class
Syntax hints:  wa 398   = wceq 1536  wcel 2113  wral 3137   × cxp 5546  wf 6344  crio 7106  (class class class)co 7149  cr 10529   + caddc 10533   cresub 39271
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 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2792  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5323  ax-un 7454  ax-resscn 10587  ax-addrcl 10591  ax-addass 10595  ax-rnegex 10601  ax-pre-lttri 10604  ax-pre-lttrn 10605  ax-pre-ltadd 10606
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1083  df-3an 1084  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2892  df-nfc 2962  df-ne 3016  df-nel 3123  df-ral 3142  df-rex 3143  df-reu 3144  df-rmo 3145  df-rab 3146  df-v 3493  df-sbc 3769  df-csb 3877  df-dif 3932  df-un 3934  df-in 3936  df-ss 3945  df-nul 4285  df-if 4461  df-pw 4534  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-iun 4914  df-br 5060  df-opab 5122  df-mpt 5140  df-id 5453  df-po 5467  df-so 5468  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356  df-riota 7107  df-ov 7152  df-oprab 7153  df-mpo 7154  df-1st 7682  df-2nd 7683  df-er 8282  df-en 8503  df-dom 8504  df-sdom 8505  df-pnf 10670  df-mnf 10671  df-ltxr 10673  df-resub 39272
This theorem is referenced by: (None)
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