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Theorem 0idsr 11120
Description: The signed real number 0 is an identity element for addition of signed reals. (Contributed by NM, 10-Apr-1996.) (New usage is discouraged.)
Assertion
Ref Expression
0idsr (𝐴R → (𝐴 +R 0R) = 𝐴)

Proof of Theorem 0idsr
Dummy variables 𝑥 𝑦 𝑧 𝑤 𝑣 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-nr 11079 . 2 R = ((P × P) / ~R )
2 oveq1 7427 . . 3 ([⟨𝑥, 𝑦⟩] ~R = 𝐴 → ([⟨𝑥, 𝑦⟩] ~R +R 0R) = (𝐴 +R 0R))
3 id 22 . . 3 ([⟨𝑥, 𝑦⟩] ~R = 𝐴 → [⟨𝑥, 𝑦⟩] ~R = 𝐴)
42, 3eqeq12d 2744 . 2 ([⟨𝑥, 𝑦⟩] ~R = 𝐴 → (([⟨𝑥, 𝑦⟩] ~R +R 0R) = [⟨𝑥, 𝑦⟩] ~R ↔ (𝐴 +R 0R) = 𝐴))
5 df-0r 11083 . . . 4 0R = [⟨1P, 1P⟩] ~R
65oveq2i 7431 . . 3 ([⟨𝑥, 𝑦⟩] ~R +R 0R) = ([⟨𝑥, 𝑦⟩] ~R +R [⟨1P, 1P⟩] ~R )
7 1pr 11038 . . . . 5 1PP
8 addsrpr 11098 . . . . 5 (((𝑥P𝑦P) ∧ (1PP ∧ 1PP)) → ([⟨𝑥, 𝑦⟩] ~R +R [⟨1P, 1P⟩] ~R ) = [⟨(𝑥 +P 1P), (𝑦 +P 1P)⟩] ~R )
97, 7, 8mpanr12 704 . . . 4 ((𝑥P𝑦P) → ([⟨𝑥, 𝑦⟩] ~R +R [⟨1P, 1P⟩] ~R ) = [⟨(𝑥 +P 1P), (𝑦 +P 1P)⟩] ~R )
10 addclpr 11041 . . . . . . 7 ((𝑥P ∧ 1PP) → (𝑥 +P 1P) ∈ P)
117, 10mpan2 690 . . . . . 6 (𝑥P → (𝑥 +P 1P) ∈ P)
12 addclpr 11041 . . . . . . 7 ((𝑦P ∧ 1PP) → (𝑦 +P 1P) ∈ P)
137, 12mpan2 690 . . . . . 6 (𝑦P → (𝑦 +P 1P) ∈ P)
1411, 13anim12i 612 . . . . 5 ((𝑥P𝑦P) → ((𝑥 +P 1P) ∈ P ∧ (𝑦 +P 1P) ∈ P))
15 vex 3475 . . . . . . 7 𝑥 ∈ V
16 vex 3475 . . . . . . 7 𝑦 ∈ V
177elexi 3491 . . . . . . 7 1P ∈ V
18 addcompr 11044 . . . . . . 7 (𝑧 +P 𝑤) = (𝑤 +P 𝑧)
19 addasspr 11045 . . . . . . 7 ((𝑧 +P 𝑤) +P 𝑣) = (𝑧 +P (𝑤 +P 𝑣))
2015, 16, 17, 18, 19caov12 7649 . . . . . 6 (𝑥 +P (𝑦 +P 1P)) = (𝑦 +P (𝑥 +P 1P))
21 enreceq 11089 . . . . . 6 (((𝑥P𝑦P) ∧ ((𝑥 +P 1P) ∈ P ∧ (𝑦 +P 1P) ∈ P)) → ([⟨𝑥, 𝑦⟩] ~R = [⟨(𝑥 +P 1P), (𝑦 +P 1P)⟩] ~R ↔ (𝑥 +P (𝑦 +P 1P)) = (𝑦 +P (𝑥 +P 1P))))
2220, 21mpbiri 258 . . . . 5 (((𝑥P𝑦P) ∧ ((𝑥 +P 1P) ∈ P ∧ (𝑦 +P 1P) ∈ P)) → [⟨𝑥, 𝑦⟩] ~R = [⟨(𝑥 +P 1P), (𝑦 +P 1P)⟩] ~R )
2314, 22mpdan 686 . . . 4 ((𝑥P𝑦P) → [⟨𝑥, 𝑦⟩] ~R = [⟨(𝑥 +P 1P), (𝑦 +P 1P)⟩] ~R )
249, 23eqtr4d 2771 . . 3 ((𝑥P𝑦P) → ([⟨𝑥, 𝑦⟩] ~R +R [⟨1P, 1P⟩] ~R ) = [⟨𝑥, 𝑦⟩] ~R )
256, 24eqtrid 2780 . 2 ((𝑥P𝑦P) → ([⟨𝑥, 𝑦⟩] ~R +R 0R) = [⟨𝑥, 𝑦⟩] ~R )
261, 4, 25ecoptocl 8825 1 (𝐴R → (𝐴 +R 0R) = 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395   = wceq 1534  wcel 2099  cop 4635  (class class class)co 7420  [cec 8722  Pcnp 10882  1Pc1p 10883   +P cpp 10884   ~R cer 10887  Rcnr 10888  0Rc0r 10889   +R cplr 10892
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-10 2130  ax-11 2147  ax-12 2167  ax-ext 2699  ax-sep 5299  ax-nul 5306  ax-pow 5365  ax-pr 5429  ax-un 7740  ax-inf2 9664
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 847  df-3or 1086  df-3an 1087  df-tru 1537  df-fal 1547  df-ex 1775  df-nf 1779  df-sb 2061  df-mo 2530  df-eu 2559  df-clab 2706  df-cleq 2720  df-clel 2806  df-nfc 2881  df-ne 2938  df-ral 3059  df-rex 3068  df-rmo 3373  df-reu 3374  df-rab 3430  df-v 3473  df-sbc 3777  df-csb 3893  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-pss 3966  df-nul 4324  df-if 4530  df-pw 4605  df-sn 4630  df-pr 4632  df-op 4636  df-uni 4909  df-int 4950  df-iun 4998  df-br 5149  df-opab 5211  df-mpt 5232  df-tr 5266  df-id 5576  df-eprel 5582  df-po 5590  df-so 5591  df-fr 5633  df-we 5635  df-xp 5684  df-rel 5685  df-cnv 5686  df-co 5687  df-dm 5688  df-rn 5689  df-res 5690  df-ima 5691  df-pred 6305  df-ord 6372  df-on 6373  df-lim 6374  df-suc 6375  df-iota 6500  df-fun 6550  df-fn 6551  df-f 6552  df-f1 6553  df-fo 6554  df-f1o 6555  df-fv 6556  df-ov 7423  df-oprab 7424  df-mpo 7425  df-om 7871  df-1st 7993  df-2nd 7994  df-frecs 8286  df-wrecs 8317  df-recs 8391  df-rdg 8430  df-1o 8486  df-oadd 8490  df-omul 8491  df-er 8724  df-ec 8726  df-qs 8730  df-ni 10895  df-pli 10896  df-mi 10897  df-lti 10898  df-plpq 10931  df-mpq 10932  df-ltpq 10933  df-enq 10934  df-nq 10935  df-erq 10936  df-plq 10937  df-mq 10938  df-1nq 10939  df-rq 10940  df-ltnq 10941  df-np 11004  df-1p 11005  df-plp 11006  df-ltp 11008  df-enr 11078  df-nr 11079  df-plr 11080  df-0r 11083
This theorem is referenced by:  addgt0sr  11127  sqgt0sr  11129  map2psrpr  11133  supsrlem  11134  addresr  11161  mulresr  11162  axi2m1  11182  axcnre  11187
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