Theorem axaddrcl 10892

Description: Closure law for addition in the real subfield of complex numbers. Axiom 5 of 22 for real and complex numbers, derived from ZF set theory. This construction-dependent theorem should not be referenced directly, nor should the proven axiom ax-addrcl 10916 be used later. Instead, in most cases use readdcl 10938. (Contributed by NM, 31-Mar-1996.) (New usage is discouraged.)

Assertion

Ref	Expression
axaddrcl	⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 + 𝐵) ∈ ℝ)

Proof of Theorem axaddrcl

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		elreal 10871	. 2 ⊢ (𝐴 ∈ ℝ ↔ ∃𝑥 ∈ R ⟨𝑥, 0R⟩ = 𝐴)
2		elreal 10871	. 2 ⊢ (𝐵 ∈ ℝ ↔ ∃𝑦 ∈ R ⟨𝑦, 0R⟩ = 𝐵)
3		oveq1 7275	. . 3 ⊢ (⟨𝑥, 0R⟩ = 𝐴 → (⟨𝑥, 0R⟩ + ⟨𝑦, 0R⟩) = (𝐴 + ⟨𝑦, 0R⟩))
4	3	eleq1d 2824	. 2 ⊢ (⟨𝑥, 0R⟩ = 𝐴 → ((⟨𝑥, 0R⟩ + ⟨𝑦, 0R⟩) ∈ ℝ ↔ (𝐴 + ⟨𝑦, 0R⟩) ∈ ℝ))
5		oveq2 7276	. . 3 ⊢ (⟨𝑦, 0R⟩ = 𝐵 → (𝐴 + ⟨𝑦, 0R⟩) = (𝐴 + 𝐵))
6	5	eleq1d 2824	. 2 ⊢ (⟨𝑦, 0R⟩ = 𝐵 → ((𝐴 + ⟨𝑦, 0R⟩) ∈ ℝ ↔ (𝐴 + 𝐵) ∈ ℝ))
7		addresr 10878	. . 3 ⊢ ((𝑥 ∈ R ∧ 𝑦 ∈ R) → (⟨𝑥, 0R⟩ + ⟨𝑦, 0R⟩) = ⟨(𝑥 +R 𝑦), 0R⟩)
8		addclsr 10823	. . . 4 ⊢ ((𝑥 ∈ R ∧ 𝑦 ∈ R) → (𝑥 +R 𝑦) ∈ R)
9		opelreal 10870	. . . 4 ⊢ (⟨(𝑥 +R 𝑦), 0R⟩ ∈ ℝ ↔ (𝑥 +R 𝑦) ∈ R)
10	8, 9	sylibr 233	. . 3 ⊢ ((𝑥 ∈ R ∧ 𝑦 ∈ R) → ⟨(𝑥 +R 𝑦), 0R⟩ ∈ ℝ)
11	7, 10	eqeltrd 2840	. 2 ⊢ ((𝑥 ∈ R ∧ 𝑦 ∈ R) → (⟨𝑥, 0R⟩ + ⟨𝑦, 0R⟩) ∈ ℝ)
12	1, 2, 4, 6, 11	2gencl 3470	1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 + 𝐵) ∈ ℝ)

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1541   ∈ wcel 2109  ⟨cop 4572  (class class class)co 7268  Rcnr 10605  0_Rc0r 10606   +_R cplr 10609  ℝcr 10854   + caddc 10858

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1801  ax-4 1815  ax-5 1916  ax-6 1974  ax-7 2014  ax-8 2111  ax-9 2119  ax-10 2140  ax-11 2157  ax-12 2174  ax-ext 2710  ax-sep 5226  ax-nul 5233  ax-pow 5291  ax-pr 5355  ax-un 7579  ax-inf2 9360

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1544  df-fal 1554  df-ex 1786  df-nf 1790  df-sb 2071  df-mo 2541  df-eu 2570  df-clab 2717  df-cleq 2731  df-clel 2817  df-nfc 2890  df-ne 2945  df-ral 3070  df-rex 3071  df-reu 3072  df-rmo 3073  df-rab 3074  df-v 3432  df-sbc 3720  df-csb 3837  df-dif 3894  df-un 3896  df-in 3898  df-ss 3908  df-pss 3910  df-nul 4262  df-if 4465  df-pw 4540  df-sn 4567  df-pr 4569  df-tp 4571  df-op 4573  df-uni 4845  df-int 4885  df-iun 4931  df-br 5079  df-opab 5141  df-mpt 5162  df-tr 5196  df-id 5488  df-eprel 5494  df-po 5502  df-so 5503  df-fr 5543  df-we 5545  df-xp 5594  df-rel 5595  df-cnv 5596  df-co 5597  df-dm 5598  df-rn 5599  df-res 5600  df-ima 5601  df-pred 6199  df-ord 6266  df-on 6267  df-lim 6268  df-suc 6269  df-iota 6388  df-fun 6432  df-fn 6433  df-f 6434  df-f1 6435  df-fo 6436  df-f1o 6437  df-fv 6438  df-ov 7271  df-oprab 7272  df-mpo 7273  df-om 7701  df-1st 7817  df-2nd 7818  df-frecs 8081  df-wrecs 8112  df-recs 8186  df-rdg 8225  df-1o 8281  df-oadd 8285  df-omul 8286  df-er 8472  df-ec 8474  df-qs 8478  df-ni 10612  df-pli 10613  df-mi 10614  df-lti 10615  df-plpq 10648  df-mpq 10649  df-ltpq 10650  df-enq 10651  df-nq 10652  df-erq 10653  df-plq 10654  df-mq 10655  df-1nq 10656  df-rq 10657  df-ltnq 10658  df-np 10721  df-1p 10722  df-plp 10723  df-ltp 10725  df-enr 10795  df-nr 10796  df-plr 10797  df-0r 10800  df-c 10861  df-r 10865  df-add 10866

This theorem is referenced by: (None)